∫(cot^2 x/sin^2 x)dx=?

∫(cot^2 x/sin^2 x)dx=? 求∫(cot x)^2 dx cot ^2x dx 等于多少 ∫cot(3x)dx. ∫cot^x dx= cot^2x dx.为什么等于csc^2-1 dx 求下列不定积分.求详解（1）∫[(cos 2x)／(cos x﹢sin x)]dx; (2) ∫cot²xdx; (3) ∫{(1+2x²)／[x²(1+x²)]}dx; (4) ∫sin²(x／2)dx; (5) ∫[(cos2x)／(sin²xcos²x)]dx; (6) ∫[e^(x-4)]dx;求解 ∫x/sin^2(x) dx ∫sin(x) cos^2(x)dx 求∫(tan^x+cot^x)dx 求不定积分：∫dx/sin^4(x) 答案是-1/3cot^3(x)-cotx+C ∫sin^2x/(1+sin^2x )dx求解, ∫sin(6x)sin(2x)dx=? 求不定积分 ∫(sin^5x sin^2x)dx抱歉是∫(sin^5x+sin^2x)dx ∫cot^4 x dx 怎么积分? 求不定积分 (tanx+2cot^2x)^2dx 设y=(tan2x)^cot(x/2) ,求dy/dx 证明(1+cot^2x)/(1-cot^2x)=1/(2sin^2x-1)