-π/3 ∫(sin x+cos x)dx=? -π/4

求不定积分∫cos x/(sin x+cos x) d x, 如果f(cos x)=sin 3x,那么f(sin x)等于A.sin 3x B.-sin 3x Ccos 3x D-cos 3x d/dx sin^8(cos(4x)) 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 使用微积分基本原理 （1）∫(x sin√(x^2+4))/√(x^2+4) dx（2）∫x^2 sin(x^3+5) cos^9 (x^3+5)dx（3）∫_0^(π/2)sinxsin(cosx)dx（4）∫_(-π/2)^(π/2)cosθ cos(π sinθ)dθ 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? cos(x+π/3)是不是等于sin(x-π/6) cos(π/6-x)=sin(π/3+x)?为什么 求不定积分：∫(sin x/cos^3 x)dx ∫(cos^3x/sin^2x)dx 求不定积分：∫(sin x/cos^3 x)dx ∫cos^4x/sin^3x dx=? ∫sin(3x)cos(4x)dx= ∫ [cos^3(x)]/[sin^2 (x)]dx ∫sin^3(x)cos^2(x)dx= 求积分：∫sin^2 (x) /cos^3 (x) dx ∫ sin^4(x)cos^3(x)dx ∫sin(x) cos^2(x)dx