基本积分表
按知识点浏览 · 共 30 题
第1题计算题
1.计算下列积分.
(1) $\displaystyle \int \sqrt{1+\cos x} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\sec ^{2} x}{4+\tan ^{2} x} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{\cos ^{4} x \sin ^{4} x}$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{1+\tan x}$ .
(1) $\displaystyle \int \sqrt{1+\cos x} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\sec ^{2} x}{4+\tan ^{2} x} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{\cos ^{4} x \sin ^{4} x}$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{1+\tan x}$ .
第1题计算题
1.求下列积分.
(1) $\displaystyle \int_{0}^{a} \sqrt{a^{2}-x^{2}} \mathrm{~d} x .(a=2$ :山东师大 2007;$\displaystyle a=1$ :广西民大 2009,曲阜师大 2008)
(2) $\displaystyle \int_{1}^{2} \sqrt{x^{2}-1} \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{a} x^{2} \sqrt{a^{2}-x^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{2 a} x \sqrt{2 a x-x^{2}} \mathrm{~d} x$ 。
(5) $\displaystyle \int_{0}^{2} \sqrt{x^{3}-2 x^{2}+x} \mathrm{~d} x$ .
(6) $\displaystyle \int_{0}^{a} x^{2} \sqrt{\frac{a-x}{a+x}} \mathrm{~d} x(a>0)$ .
(7) $\displaystyle \int_{0}^{1} \frac{x}{\sqrt{1-x^{2}}} \mathrm{~d} x$ .
(1) $\displaystyle \int_{0}^{a} \sqrt{a^{2}-x^{2}} \mathrm{~d} x .(a=2$ :山东师大 2007;$\displaystyle a=1$ :广西民大 2009,曲阜师大 2008)
(2) $\displaystyle \int_{1}^{2} \sqrt{x^{2}-1} \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{a} x^{2} \sqrt{a^{2}-x^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{2 a} x \sqrt{2 a x-x^{2}} \mathrm{~d} x$ 。
(5) $\displaystyle \int_{0}^{2} \sqrt{x^{3}-2 x^{2}+x} \mathrm{~d} x$ .
(6) $\displaystyle \int_{0}^{a} x^{2} \sqrt{\frac{a-x}{a+x}} \mathrm{~d} x(a>0)$ .
(7) $\displaystyle \int_{0}^{1} \frac{x}{\sqrt{1-x^{2}}} \mathrm{~d} x$ .
第1题计算题
1.计算下列反常积分.
(1) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-a x} \sin b x \mathrm{~d} x(a>0)$ .(哈工大 2001,燕山大学 2010( $\displaystyle b=2$ );$\displaystyle a=1, b=2$ :湖南师大 2011,南京农大 2007)
(2) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-x} \cos b x \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-a x} \cos ^{2} x \mathrm{~d} x(a>0)$ 。
(1) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-a x} \sin b x \mathrm{~d} x(a>0)$ .(哈工大 2001,燕山大学 2010( $\displaystyle b=2$ );$\displaystyle a=1, b=2$ :湖南师大 2011,南京农大 2007)
(2) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-x} \cos b x \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{+\infty} \mathrm{e}^{-a x} \cos ^{2} x \mathrm{~d} x(a>0)$ 。
第2题计算题
2.计算下列积分.
(1) $\displaystyle \int \frac{\cos x \sin ^{3} x}{1+\cos ^{2} x} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\sin x \cos ^{3} x}{1+\sin ^{2} x} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{a^{2} \sin ^{2} x+b^{2} \cos ^{2} x}(a b \neq 0)$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{\tan x+\sin x}$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{\cos 2 x \sin x}$ .
(1) $\displaystyle \int \frac{\cos x \sin ^{3} x}{1+\cos ^{2} x} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\sin x \cos ^{3} x}{1+\sin ^{2} x} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{a^{2} \sin ^{2} x+b^{2} \cos ^{2} x}(a b \neq 0)$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{\tan x+\sin x}$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{\cos 2 x \sin x}$ .
第2题计算题
2.求下列积分.
(1) $\displaystyle \int_{1}^{9} x \sqrt[3]{1-x} \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{4} \frac{x+2}{\sqrt{2 x+1}} \mathrm{~d} x$ .
(3) $\displaystyle \int_{1}^{4} \frac{1}{x(1+\sqrt{x})} \mathrm{d} x$ .
(4) $\displaystyle \int_{0}^{1}\left(\frac{x+1}{\sqrt[3]{3 x+1}}+x \arctan x\right) \mathrm{d} x$ .
(1) $\displaystyle \int_{1}^{9} x \sqrt[3]{1-x} \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{4} \frac{x+2}{\sqrt{2 x+1}} \mathrm{~d} x$ .
(3) $\displaystyle \int_{1}^{4} \frac{1}{x(1+\sqrt{x})} \mathrm{d} x$ .
(4) $\displaystyle \int_{0}^{1}\left(\frac{x+1}{\sqrt[3]{3 x+1}}+x \arctan x\right) \mathrm{d} x$ .
第3题计算题
3.求下列积分.
(1) $\displaystyle \int \frac{\mathrm{d} x}{1+\sin x}$ .
(2) $\displaystyle \int \frac{\mathrm{d} x}{1+4 \cos x}$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{\cos x \sin ^{3} x}$ 。
(4) $\displaystyle \int \frac{\mathrm{d} x}{2+\cos x+\sin x}$ .
(5) $\displaystyle \int \frac{5 \sin x+2 \cos x}{\sin x+3 \cos x} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{\ln \left(2+\sin ^{2} x\right)}{\left(1+\sin ^{2} x\right)^{2}} \sin 2 x \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\sqrt{1+\sin x}}{\cos x} \mathrm{~d} x$ .
(1) $\displaystyle \int \frac{\mathrm{d} x}{1+\sin x}$ .
(2) $\displaystyle \int \frac{\mathrm{d} x}{1+4 \cos x}$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{\cos x \sin ^{3} x}$ 。
(4) $\displaystyle \int \frac{\mathrm{d} x}{2+\cos x+\sin x}$ .
(5) $\displaystyle \int \frac{5 \sin x+2 \cos x}{\sin x+3 \cos x} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{\ln \left(2+\sin ^{2} x\right)}{\left(1+\sin ^{2} x\right)^{2}} \sin 2 x \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\sqrt{1+\sin x}}{\cos x} \mathrm{~d} x$ .
第3题计算题
3.求下列积分.
(1) $\displaystyle \int_{-2}^{2} \mathrm{e}^{-|\mathrm{x}|}|1-\mathrm{x}| \mathrm{d} x$ .
(2) $\displaystyle \int_{1}^{3} \sqrt{|x(x-2)|} \mathrm{d} x$ .
(3) $\displaystyle \int_{1}^{n+1} \ln [x] \mathrm{d} x, n \in \mathbf{N}^{+}$.
(4) $\displaystyle \int_{0}^{2}\left[\mathrm{e}^{x}\right] \mathrm{d} x$ .
(5) $\displaystyle \int_{-1}^{3} \min \left\{\frac{1}{2}, \frac{1}{2} x^{2}\right\} \mathrm{d} x$ .
(6) $\displaystyle \int_{-2}^{2} \max \left\{1, x^{2}\right\} \mathrm{d} x$ 。
(7) $\displaystyle \int_{-1}^{2} \min \left\{2, x^{2}\right\} \mathrm{d} x$ 。
(1) $\displaystyle \int_{-2}^{2} \mathrm{e}^{-|\mathrm{x}|}|1-\mathrm{x}| \mathrm{d} x$ .
(2) $\displaystyle \int_{1}^{3} \sqrt{|x(x-2)|} \mathrm{d} x$ .
(3) $\displaystyle \int_{1}^{n+1} \ln [x] \mathrm{d} x, n \in \mathbf{N}^{+}$.
(4) $\displaystyle \int_{0}^{2}\left[\mathrm{e}^{x}\right] \mathrm{d} x$ .
(5) $\displaystyle \int_{-1}^{3} \min \left\{\frac{1}{2}, \frac{1}{2} x^{2}\right\} \mathrm{d} x$ .
(6) $\displaystyle \int_{-2}^{2} \max \left\{1, x^{2}\right\} \mathrm{d} x$ 。
(7) $\displaystyle \int_{-1}^{2} \min \left\{2, x^{2}\right\} \mathrm{d} x$ 。
第5题计算题
5.求下列积分.
(1) $\displaystyle \int \arctan 2 x \mathrm{~d} x$ 。
(2) $\displaystyle \int x \arctan x \mathrm{~d} x$ 。
(3) $\displaystyle \int \arctan \sqrt{x} \mathrm{~d} x$ .
(1) $\displaystyle \int \arctan 2 x \mathrm{~d} x$ 。
(2) $\displaystyle \int x \arctan x \mathrm{~d} x$ 。
(3) $\displaystyle \int \arctan \sqrt{x} \mathrm{~d} x$ .
第5题计算题
5.求下列积分.
(1) $\displaystyle \int_{0}^{1} x^{2} \arctan x \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{\pi}(x \sin x)^{2} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{2 \pi} x \cos ^{2} x \mathrm{~d} x$ 。
(4) $\displaystyle \int_{0}^{\pi} x^{2} \sqrt{1-\cos 2 x} \mathrm{~d} x$ .
(5) $\displaystyle \int_{0}^{\frac{1}{2}} \frac{\arcsin x}{\sqrt{\left(1-x^{2}\right)^{3}}} \mathrm{dx}$ .
(6) $\displaystyle \int_{0}^{1} \frac{\arcsin \sqrt{x}}{\sqrt{x(1-x)}} \mathrm{d} x$ 。
(1) $\displaystyle \int_{0}^{1} x^{2} \arctan x \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{\pi}(x \sin x)^{2} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{2 \pi} x \cos ^{2} x \mathrm{~d} x$ 。
(4) $\displaystyle \int_{0}^{\pi} x^{2} \sqrt{1-\cos 2 x} \mathrm{~d} x$ .
(5) $\displaystyle \int_{0}^{\frac{1}{2}} \frac{\arcsin x}{\sqrt{\left(1-x^{2}\right)^{3}}} \mathrm{dx}$ .
(6) $\displaystyle \int_{0}^{1} \frac{\arcsin \sqrt{x}}{\sqrt{x(1-x)}} \mathrm{d} x$ 。
第6题计算题
6.求下列积分.
(1) $\displaystyle \int \sqrt{x} \sin \sqrt{x} \mathrm{~d} x$ .
(2) $\displaystyle \int \cos ^{2} \sqrt{x} \mathrm{~d} x$ .
(3) $\displaystyle \int x \sin a x \cos b x \mathrm{~d} x\left(a \neq 0, b \neq 0, a^{2} \neq b^{2}\right)$ 。北京交大 2004)
(1) $\displaystyle \int \sqrt{x} \sin \sqrt{x} \mathrm{~d} x$ .
(2) $\displaystyle \int \cos ^{2} \sqrt{x} \mathrm{~d} x$ .
(3) $\displaystyle \int x \sin a x \cos b x \mathrm{~d} x\left(a \neq 0, b \neq 0, a^{2} \neq b^{2}\right)$ 。北京交大 2004)
第6题计算题
6.求下列积分.
(1) $\displaystyle \int_{0}^{1} \ln x \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{1} \ln \frac{1}{1-x} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{1}(\ln x)^{2} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{1}(\ln x)^{n} \mathrm{~d} x$. .
(5) $\displaystyle \int_{1}^{\mathrm{e}+1} x^{2} \ln (x-1) \mathrm{d} x$ .
(6) $\displaystyle \int_{0}^{1}\left[\frac{x(1+x)}{\sqrt{1+2 x}}+\ln x\right] \mathrm{d} x$ .
(7) $\displaystyle \int_{e^{-1}}^{e}|\ln x| d x$ .
(1) $\displaystyle \int_{0}^{1} \ln x \mathrm{~d} x$ 。
(2) $\displaystyle \int_{0}^{1} \ln \frac{1}{1-x} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{1}(\ln x)^{2} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{1}(\ln x)^{n} \mathrm{~d} x$. .
(5) $\displaystyle \int_{1}^{\mathrm{e}+1} x^{2} \ln (x-1) \mathrm{d} x$ .
(6) $\displaystyle \int_{0}^{1}\left[\frac{x(1+x)}{\sqrt{1+2 x}}+\ln x\right] \mathrm{d} x$ .
(7) $\displaystyle \int_{e^{-1}}^{e}|\ln x| d x$ .
第7题计算题
7.求下列积分.
(1)设 $\displaystyle m, n$ 为正整数,求 $\displaystyle \int_{0}^{1} t^{n}(\ln t)^{m} \mathrm{~d} t$ 。华中科技 2014,湖南大学 2006,西安理工 2005,北师大,武汉大学 2014( $\displaystyle m=n$ ))
(2) $\displaystyle \int_{0}^{1} x \ln x \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{1} x^{2}(\ln x)^{2} \mathrm{~d} x$ 。
(4) $\displaystyle \int_{1}^{e}(x \ln x)^{3} \mathrm{~d} x$ 。
(5) $\displaystyle \int_{0}^{1} x(\ln x)^{2006} \mathrm{~d} x$ 。
(6) $\displaystyle \int_{0}^{1} x(\ln x)^{2012} \mathrm{~d} x$ 。
(1)设 $\displaystyle m, n$ 为正整数,求 $\displaystyle \int_{0}^{1} t^{n}(\ln t)^{m} \mathrm{~d} t$ 。华中科技 2014,湖南大学 2006,西安理工 2005,北师大,武汉大学 2014( $\displaystyle m=n$ ))
(2) $\displaystyle \int_{0}^{1} x \ln x \mathrm{~d} x$ 。
(3) $\displaystyle \int_{0}^{1} x^{2}(\ln x)^{2} \mathrm{~d} x$ 。
(4) $\displaystyle \int_{1}^{e}(x \ln x)^{3} \mathrm{~d} x$ 。
(5) $\displaystyle \int_{0}^{1} x(\ln x)^{2006} \mathrm{~d} x$ 。
(6) $\displaystyle \int_{0}^{1} x(\ln x)^{2012} \mathrm{~d} x$ 。
第8题计算题
8.设 $\displaystyle n$ 为自然数,求下列不定积分的递推公式.
(1)$\displaystyle I_{n}=\int \tan ^{n} x \mathrm{~d} x$ ,并计算 $\displaystyle \int \tan ^{4} \mathrm{~d} x$ 。
(2)$\displaystyle I_{n}=\int \sec ^{n} x \mathrm{~d} x$ ,并计算 $\displaystyle \int \sec ^{3} x \mathrm{~d} x$ 。
(3)$\displaystyle I_{n}=\int x^{n} \cos x \mathrm{~d} x$ ,并计算 $\displaystyle \int x^{3} \cos x \mathrm{~d} x$ 。
(4)$\displaystyle I_{n}=\int(\ln x)^{n} \mathrm{~d} x$ ,并计算 $\displaystyle \int \ln ^{2} x \mathrm{~d} x$ 。
(1)$\displaystyle I_{n}=\int \tan ^{n} x \mathrm{~d} x$ ,并计算 $\displaystyle \int \tan ^{4} \mathrm{~d} x$ 。
(2)$\displaystyle I_{n}=\int \sec ^{n} x \mathrm{~d} x$ ,并计算 $\displaystyle \int \sec ^{3} x \mathrm{~d} x$ 。
(3)$\displaystyle I_{n}=\int x^{n} \cos x \mathrm{~d} x$ ,并计算 $\displaystyle \int x^{3} \cos x \mathrm{~d} x$ 。
(4)$\displaystyle I_{n}=\int(\ln x)^{n} \mathrm{~d} x$ ,并计算 $\displaystyle \int \ln ^{2} x \mathrm{~d} x$ 。
第8题计算题
8.求下列积分.
(1) $\displaystyle \int_{\mathrm{e}}^{\mathrm{e}^{2}} \frac{\ln (\ln x)}{x \ln x} \mathrm{~d} x$ .
(2) $\displaystyle \int_{1}^{\mathrm{e}} \frac{1}{x\left(2+\ln ^{2} x\right)} \mathrm{d} x$ .
(3) $\displaystyle \int_{0}^{1} \frac{1}{\mathrm{e}^{x}+\mathrm{e}^{-x}} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{\ln 2} \sqrt{1-\mathrm{e}^{-2 x}} \mathrm{dx}$ 。
(5) $\displaystyle \int_{0}^{\ln 2} \sqrt{\mathrm{e}^{x}-1} \mathrm{~d} x$ 。
(6) $\displaystyle \int_{0}^{\ln 2} \frac{\sqrt{\mathrm{e}^{x}-1}}{\mathrm{e}^{x}} \mathrm{~d} x$ .
(1) $\displaystyle \int_{\mathrm{e}}^{\mathrm{e}^{2}} \frac{\ln (\ln x)}{x \ln x} \mathrm{~d} x$ .
(2) $\displaystyle \int_{1}^{\mathrm{e}} \frac{1}{x\left(2+\ln ^{2} x\right)} \mathrm{d} x$ .
(3) $\displaystyle \int_{0}^{1} \frac{1}{\mathrm{e}^{x}+\mathrm{e}^{-x}} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{\ln 2} \sqrt{1-\mathrm{e}^{-2 x}} \mathrm{dx}$ 。
(5) $\displaystyle \int_{0}^{\ln 2} \sqrt{\mathrm{e}^{x}-1} \mathrm{~d} x$ 。
(6) $\displaystyle \int_{0}^{\ln 2} \frac{\sqrt{\mathrm{e}^{x}-1}}{\mathrm{e}^{x}} \mathrm{~d} x$ .
第9题计算题
9.求下列积分.
(1) $\displaystyle \int \mathrm{e}^{a x} \sin b x \mathrm{~d} x$ .(湖南师大2010(b=1),深圳大学 2006( $\displaystyle a=1, b=1$ ),湘潭大学 2008( $\displaystyle a=1, b=2$ ))
(2) $\displaystyle \int \cos (\ln x) \mathrm{d} x, \int \sin (\ln x) \mathrm{d} x$ 。
(3) $\displaystyle \int \mathrm{e}^{x} \sin ^{2} x \mathrm{~d} x$ .
(4) $\displaystyle \int x \mathrm{e}^{x} \cos x \mathrm{~d} x, \int x \mathrm{e}^{x} \sin x \mathrm{~d} x$ 。
(5) $\displaystyle \int \frac{x \mathrm{e}^{\arctan x}}{\left(1+x^{2}\right)^{\frac{3}{2}}} \mathrm{~d} x$ .
(6) $\displaystyle \int \mathrm{e}^{\sin x} \frac{x \cos ^{3} x-\sin x}{\cos ^{2} x} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\ln \sin x}{\sin ^{2} x} \mathrm{~d} x$ .
(1) $\displaystyle \int \mathrm{e}^{a x} \sin b x \mathrm{~d} x$ .(湖南师大2010(b=1),深圳大学 2006( $\displaystyle a=1, b=1$ ),湘潭大学 2008( $\displaystyle a=1, b=2$ ))
(2) $\displaystyle \int \cos (\ln x) \mathrm{d} x, \int \sin (\ln x) \mathrm{d} x$ 。
(3) $\displaystyle \int \mathrm{e}^{x} \sin ^{2} x \mathrm{~d} x$ .
(4) $\displaystyle \int x \mathrm{e}^{x} \cos x \mathrm{~d} x, \int x \mathrm{e}^{x} \sin x \mathrm{~d} x$ 。
(5) $\displaystyle \int \frac{x \mathrm{e}^{\arctan x}}{\left(1+x^{2}\right)^{\frac{3}{2}}} \mathrm{~d} x$ .
(6) $\displaystyle \int \mathrm{e}^{\sin x} \frac{x \cos ^{3} x-\sin x}{\cos ^{2} x} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\ln \sin x}{\sin ^{2} x} \mathrm{~d} x$ .
第9题证明题
9.求证下列问题.
(1)证明:当 $\displaystyle x>0$ 时,恒有 $\displaystyle \mathrm{e}^{x}-\mathrm{e}^{\int_{\ln 2} \frac{\mathrm{~d} t}{1-\mathrm{e}^{-1}}}=1$ .
(2)设 $\displaystyle \int_{x}^{2 \ln 2} \frac{\mathrm{~d} t .}{\sqrt{\mathrm{e}^{t}-1}}=\frac{\pi}{6}$ ,求 $\displaystyle x$ .
(1)证明:当 $\displaystyle x>0$ 时,恒有 $\displaystyle \mathrm{e}^{x}-\mathrm{e}^{\int_{\ln 2} \frac{\mathrm{~d} t}{1-\mathrm{e}^{-1}}}=1$ .
(2)设 $\displaystyle \int_{x}^{2 \ln 2} \frac{\mathrm{~d} t .}{\sqrt{\mathrm{e}^{t}-1}}=\frac{\pi}{6}$ ,求 $\displaystyle x$ .
第11题求解题
11.求下列不定积分.
(1) $\displaystyle \int \frac{1+\ln x}{(x \ln x)^{2}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\ln x}{x \sqrt{1+\ln x}} \mathrm{~d} x$ .
(3) $\displaystyle \int x^{x}(1+\ln x) \mathrm{d} x$ 。
(4) $\displaystyle \int \frac{\ln (1+x)-\ln x}{x(x+1)} \mathrm{d} x$ .
(5) $\displaystyle \int\left(\ln \ln x+\frac{1}{\ln x}\right) \mathrm{d} x$ .
(1) $\displaystyle \int \frac{1+\ln x}{(x \ln x)^{2}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\ln x}{x \sqrt{1+\ln x}} \mathrm{~d} x$ .
(3) $\displaystyle \int x^{x}(1+\ln x) \mathrm{d} x$ 。
(4) $\displaystyle \int \frac{\ln (1+x)-\ln x}{x(x+1)} \mathrm{d} x$ .
(5) $\displaystyle \int\left(\ln \ln x+\frac{1}{\ln x}\right) \mathrm{d} x$ .
第13题求解题
13.求下列不定积分.
(1) $\displaystyle \int \ln (\sqrt{x+2}) \mathrm{d} x$ .
(2) $\displaystyle \int \ln \left(x+\sqrt{x^{2}-a^{2}}\right) \mathrm{d} x$ .
(3) $\displaystyle \int \ln \left(x+\sqrt{x^{2}+1}\right) \mathrm{d} x$ .
(4) $\displaystyle \int \frac{x \ln \left(x+\sqrt{1+x^{2}}\right)}{\left(1+x^{2}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int x \ln \frac{1+x}{1-x} \mathrm{~d} x$ .
(6) $\displaystyle \int \sqrt{x}(\ln x)^{2} \mathrm{~d} x$ 。
(1) $\displaystyle \int \ln (\sqrt{x+2}) \mathrm{d} x$ .
(2) $\displaystyle \int \ln \left(x+\sqrt{x^{2}-a^{2}}\right) \mathrm{d} x$ .
(3) $\displaystyle \int \ln \left(x+\sqrt{x^{2}+1}\right) \mathrm{d} x$ .
(4) $\displaystyle \int \frac{x \ln \left(x+\sqrt{1+x^{2}}\right)}{\left(1+x^{2}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int x \ln \frac{1+x}{1-x} \mathrm{~d} x$ .
(6) $\displaystyle \int \sqrt{x}(\ln x)^{2} \mathrm{~d} x$ 。
第13题证明题
13.证明下列结论.
(1) $\displaystyle \int_{0}^{\pi} \frac{\sin \left(k+\frac{1}{2}\right) t}{\sin \frac{t}{2}} \mathrm{~d} t=\pi,(k=0,1,2, \cdots)$ .
(2) $\displaystyle \int_{0}^{\pi} \frac{\sin (2 n+1) x}{\sin x} \mathrm{~d} x=\int_{0}^{\pi} \frac{\sin (2 n-1) x}{\sin x} \mathrm{~d} x$ ,并计算其值,其中 $\displaystyle n$ 为正整数.
(1) $\displaystyle \int_{0}^{\pi} \frac{\sin \left(k+\frac{1}{2}\right) t}{\sin \frac{t}{2}} \mathrm{~d} t=\pi,(k=0,1,2, \cdots)$ .
(2) $\displaystyle \int_{0}^{\pi} \frac{\sin (2 n+1) x}{\sin x} \mathrm{~d} x=\int_{0}^{\pi} \frac{\sin (2 n-1) x}{\sin x} \mathrm{~d} x$ ,并计算其值,其中 $\displaystyle n$ 为正整数.
第14题计算题
14.求下列积分.
(1) $\displaystyle \int \frac{x \mathrm{e}^{-x}}{(1-x)^{2}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{x \mathrm{e}^{x}}{(1+x)^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{x^{2} \mathrm{e}^{x}}{(x+2)^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{x \mathrm{e}^{x}}{\left(1+\mathrm{e}^{x}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\ln x-1}{(x+\ln x)^{2}} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{1+x}{x\left(1-x \mathrm{e}^{x}\right)} \mathrm{dx}$ .
(7) $\displaystyle \int \frac{1+x}{x\left(1+x \mathrm{e}^{x}\right)} \mathrm{d} x$ .
(8) $\displaystyle \int \frac{1+x}{x\left(2+x \mathrm{e}^{x}\right)} \mathrm{d} x$ .
(1) $\displaystyle \int \frac{x \mathrm{e}^{-x}}{(1-x)^{2}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{x \mathrm{e}^{x}}{(1+x)^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{x^{2} \mathrm{e}^{x}}{(x+2)^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{x \mathrm{e}^{x}}{\left(1+\mathrm{e}^{x}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\ln x-1}{(x+\ln x)^{2}} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{1+x}{x\left(1-x \mathrm{e}^{x}\right)} \mathrm{dx}$ .
(7) $\displaystyle \int \frac{1+x}{x\left(1+x \mathrm{e}^{x}\right)} \mathrm{d} x$ .
(8) $\displaystyle \int \frac{1+x}{x\left(2+x \mathrm{e}^{x}\right)} \mathrm{d} x$ .
第14题证明题
14.设 $\displaystyle f(x)$ 为 $\displaystyle [-a, a]$ 上的连续函数.证明: $\displaystyle \int_{-a}^{a} f(x) \mathrm{d} x=\int_{0}^{a}(f(x)+f(-x)) \mathrm{d} x$ ,并计算 $\displaystyle \int_{-\frac{\pi}{4}}^{\frac{\pi}{4}} \frac{1}{1+\sin x} \mathrm{dx}$ 。
第15题计算题
15.求下列积分.
(1) $\displaystyle \int \frac{\mathrm{e}^{x}}{\mathrm{e}^{x}+\mathrm{e}^{-x}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\mathrm{d} x}{\mathrm{e}^{x}+\mathrm{e}^{-x}}$ .
(3) $\displaystyle \int \frac{1}{\left(\mathrm{e}^{x}+1\right)^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{\ln \left(1+\mathrm{e}^{-x}\right)}{\mathrm{e}^{x}+1} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{\sqrt{1+\mathrm{e}^{a x}}} .(a \doteq 1$ :桂林电子科技 2012,复旦大学 $\displaystyle 1998, a=2$ :上海大学 2013)
(1) $\displaystyle \int \frac{\mathrm{e}^{x}}{\mathrm{e}^{x}+\mathrm{e}^{-x}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{\mathrm{d} x}{\mathrm{e}^{x}+\mathrm{e}^{-x}}$ .
(3) $\displaystyle \int \frac{1}{\left(\mathrm{e}^{x}+1\right)^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{\ln \left(1+\mathrm{e}^{-x}\right)}{\mathrm{e}^{x}+1} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{\sqrt{1+\mathrm{e}^{a x}}} .(a \doteq 1$ :桂林电子科技 2012,复旦大学 $\displaystyle 1998, a=2$ :上海大学 2013)
第19题计算题
19.计算不定积分 $\displaystyle \int \frac{x \mathrm{~d} x}{x^{2}-2 x \cos \alpha+1}$(常数 $\displaystyle \alpha \neq k \pi, k \in \mathbf{Z}$ ).
第20题计算题
20.求下列积分.
(1) $\displaystyle \int \frac{x^{14}}{\left(1+x^{5}\right)^{4}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{1}{x\left(1+x^{3}\right)^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{1}{x+x^{n+1}} \mathrm{~d} x$ .(西南大学2004,山东科技2011( $\displaystyle n=5$ ))
(4) $\displaystyle \int \frac{1}{x^{2}(1+x)} \mathrm{d} x$ 。
(5) $\displaystyle \int \frac{1}{x^{4}\left(1+x^{2}\right)} \mathrm{d} x$ .
(6) $\displaystyle \int \frac{4 x^{3}+x^{7}}{x^{8}+9} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{x^{2}}{(1-x)^{n}} \mathrm{~d} x$ .(浙江大学 2014( $\displaystyle n=2013$ ),南京师大 2005( $\displaystyle n=100$ ),南京财大 2009( $\displaystyle n=2009$ ),南京航空 2003( $\displaystyle n=2003$ ))
(1) $\displaystyle \int \frac{x^{14}}{\left(1+x^{5}\right)^{4}} \mathrm{~d} x$ .
(2) $\displaystyle \int \frac{1}{x\left(1+x^{3}\right)^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{1}{x+x^{n+1}} \mathrm{~d} x$ .(西南大学2004,山东科技2011( $\displaystyle n=5$ ))
(4) $\displaystyle \int \frac{1}{x^{2}(1+x)} \mathrm{d} x$ 。
(5) $\displaystyle \int \frac{1}{x^{4}\left(1+x^{2}\right)} \mathrm{d} x$ .
(6) $\displaystyle \int \frac{4 x^{3}+x^{7}}{x^{8}+9} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{x^{2}}{(1-x)^{n}} \mathrm{~d} x$ .(浙江大学 2014( $\displaystyle n=2013$ ),南京师大 2005( $\displaystyle n=100$ ),南京财大 2009( $\displaystyle n=2009$ ),南京航空 2003( $\displaystyle n=2003$ ))
第21题求解题
21.求下列不定积分.
(1) $\displaystyle \int \frac{\mathrm{d} x}{x^{3}+x^{2}+x+1}$ .
(2) $\displaystyle \int \frac{x-5}{x^{3}-3 x^{2}+4} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{1+x^{3}}$ .(浙江理 $\displaystyle I$ 2013)
(4) $\displaystyle \int \frac{2 x+2}{(x-1)\left(1+x^{2}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{x+1}{\left(x^{2}+2 x+5\right)^{2}} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{x^{2}+1}{\left(x^{2}-2 x+2\right)^{2}} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\mathrm{d} x}{\left(a^{2}+x^{2}\right)^{2}}$ .
(8) $\displaystyle \int \frac{1+x^{2}}{1+x^{4}} \mathrm{~d} x$ .
(1) $\displaystyle \int \frac{\mathrm{d} x}{x^{3}+x^{2}+x+1}$ .
(2) $\displaystyle \int \frac{x-5}{x^{3}-3 x^{2}+4} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\mathrm{d} x}{1+x^{3}}$ .(浙江理 $\displaystyle I$ 2013)
(4) $\displaystyle \int \frac{2 x+2}{(x-1)\left(1+x^{2}\right)^{2}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{x+1}{\left(x^{2}+2 x+5\right)^{2}} \mathrm{~d} x$ .
(6) $\displaystyle \int \frac{x^{2}+1}{\left(x^{2}-2 x+2\right)^{2}} \mathrm{~d} x$ .
(7) $\displaystyle \int \frac{\mathrm{d} x}{\left(a^{2}+x^{2}\right)^{2}}$ .
(8) $\displaystyle \int \frac{1+x^{2}}{1+x^{4}} \mathrm{~d} x$ .
第22题计算题
22.求下列积分.
(1) $\displaystyle \int \sqrt{a^{2}+x^{2}} \mathrm{~d} x(a>0)$ .
(2) $\displaystyle \int \sqrt{a^{2}-x^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int x^{3} \sqrt{4^{2}+x^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{2}{x+\sqrt{1-x^{2}}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{x \sqrt{x^{2}-1}}$ .
(6) $\displaystyle \int \frac{\mathrm{d} x}{x \sqrt{4-x^{2}}}$ .
(1) $\displaystyle \int \sqrt{a^{2}+x^{2}} \mathrm{~d} x(a>0)$ .
(2) $\displaystyle \int \sqrt{a^{2}-x^{2}} \mathrm{~d} x$ .
(3) $\displaystyle \int x^{3} \sqrt{4^{2}+x^{2}} \mathrm{~d} x$ .
(4) $\displaystyle \int \frac{2}{x+\sqrt{1-x^{2}}} \mathrm{~d} x$ .
(5) $\displaystyle \int \frac{\mathrm{d} x}{x \sqrt{x^{2}-1}}$ .
(6) $\displaystyle \int \frac{\mathrm{d} x}{x \sqrt{4-x^{2}}}$ .
第23题计算题
23.求下列积分.
(1) $\displaystyle \int \frac{1}{\sqrt{x}(1+\sqrt[4]{x})^{3}} \mathrm{dx}$ .
(2) $\displaystyle \int \frac{1}{x^{2}} \sqrt{\frac{1+x}{1-x}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\sqrt{2+x-x^{2}} \mathrm{~d} x}{x}$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{\sqrt[3]{(x-1)^{2}(x+1)^{4}}}$ .
(5) $\displaystyle \int \frac{x+2}{\sqrt{1+2 x}} \mathrm{dx}$ .
(1) $\displaystyle \int \frac{1}{\sqrt{x}(1+\sqrt[4]{x})^{3}} \mathrm{dx}$ .
(2) $\displaystyle \int \frac{1}{x^{2}} \sqrt{\frac{1+x}{1-x}} \mathrm{~d} x$ .
(3) $\displaystyle \int \frac{\sqrt{2+x-x^{2}} \mathrm{~d} x}{x}$ .
(4) $\displaystyle \int \frac{\mathrm{d} x}{\sqrt[3]{(x-1)^{2}(x+1)^{4}}}$ .
(5) $\displaystyle \int \frac{x+2}{\sqrt{1+2 x}} \mathrm{dx}$ .
第24题求解题
24.求下列不定积分.
(1) $\displaystyle \int \mathrm{e}^{\max \{1, x\}} \mathrm{d} x$ .
(2) $\displaystyle \int \max \left\{1, x^{2}\right\} \mathrm{d} x$ 。
(3) $\displaystyle \int$ max $\displaystyle \{2,|x|\} \mathrm{d} x$ 。
(4) $\displaystyle \int \max \{1,|x|\} \mathrm{d} x$ .
(1) $\displaystyle \int \mathrm{e}^{\max \{1, x\}} \mathrm{d} x$ .
(2) $\displaystyle \int \max \left\{1, x^{2}\right\} \mathrm{d} x$ 。
(3) $\displaystyle \int$ max $\displaystyle \{2,|x|\} \mathrm{d} x$ 。
(4) $\displaystyle \int \max \{1,|x|\} \mathrm{d} x$ .
第31题证明题
31.设 $\displaystyle f(x)$ 在区间 $\displaystyle [0,1]$ 上连续,证明:$\displaystyle \left(\int_{0}^{1} \frac{f(x)}{t^{2}+x^{2}} \mathrm{~d} x\right)^{2} \leqslant \frac{\pi}{2 t} \int_{0}^{1} \frac{f^{2}(x)}{t^{2}+x^{2}} \mathrm{~d} x,(t>0)$ .