三角函数有理式的不定积分(万能代换)
按知识点浏览 · 共 4 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11题计算题
11.求下列积分.
(1) $\displaystyle \int_{0}^{\frac{\pi}{2}} \frac{\sin x \cos x}{1+\sin ^{4} x} \mathrm{~d} x$ .
(2) $\displaystyle \int_{0}^{\frac{\pi}{4}}\left(\frac{\sin x-\cos x}{\sin x+\cos x}\right)^{2} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{\pi} \frac{3+\sin 2 x}{2+\cos x} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{2 \pi} \frac{\mathrm{~d} \theta}{2+\cos \theta}$ .
(5) $\displaystyle \int_{0}^{\frac{\pi}{4}} \frac{x}{1+\cos 2 x} \mathrm{~d} x$ .
(6) $\displaystyle \int_{0}^{\pi} \frac{\cos 4 \theta d \theta}{1+\cos ^{2} \theta}$ .(浙江 大 学 2013)
(7) $\displaystyle \int_{0}^{\pi} \frac{\mathrm{d} \theta}{1-\sqrt{2} \cos \theta+a}(a>1)$ .
(8) $\displaystyle \int_{0}^{\frac{\pi}{2}} \frac{\mathrm{~d} \dot{x}}{a^{2} \sin ^{2} x+b^{2} \cos ^{2} x}$ ,其中 $\displaystyle a, b$ 为非零常数.
(1) $\displaystyle \int_{0}^{\frac{\pi}{2}} \frac{\sin x \cos x}{1+\sin ^{4} x} \mathrm{~d} x$ .
(2) $\displaystyle \int_{0}^{\frac{\pi}{4}}\left(\frac{\sin x-\cos x}{\sin x+\cos x}\right)^{2} \mathrm{~d} x$ .
(3) $\displaystyle \int_{0}^{\pi} \frac{3+\sin 2 x}{2+\cos x} \mathrm{~d} x$ .
(4) $\displaystyle \int_{0}^{2 \pi} \frac{\mathrm{~d} \theta}{2+\cos \theta}$ .
(5) $\displaystyle \int_{0}^{\frac{\pi}{4}} \frac{x}{1+\cos 2 x} \mathrm{~d} x$ .
(6) $\displaystyle \int_{0}^{\pi} \frac{\cos 4 \theta d \theta}{1+\cos ^{2} \theta}$ .(浙江 大 学 2013)
(7) $\displaystyle \int_{0}^{\pi} \frac{\mathrm{d} \theta}{1-\sqrt{2} \cos \theta+a}(a>1)$ .
(8) $\displaystyle \int_{0}^{\frac{\pi}{2}} \frac{\mathrm{~d} \dot{x}}{a^{2} \sin ^{2} x+b^{2} \cos ^{2} x}$ ,其中 $\displaystyle a, b$ 为非零常数.