d/dx(cos(3x))=多少啊

d/dx(cos(3x))=多少啊 ∫cos(x+2)dx=多少 ∫cos((x/3)-1)dx=? d{cos(x-y)=sin(x-y)(dx-dy)这里dx-dy是什么意思呢? 求d/dx (∫[pai/2,x]cos^3 tdt=? d/dx sin^8(cos(4x)) ∫cos^4x/sin^3x dx=? ∫sin(3x)cos(4x)dx= ∫sin^3(x)cos^2(x)dx= d/dx∫(x,0)f(3x)dx= 不定积分 ∫ x*cos(x/3)*dx ∫x* cos²x dx=? ∫cos(x*x)dx=? 不定积分的这道题∫ sinx / cos^3 x dx 我哪里算错了?我的计算过程：∫sinx / cos^3 x dx=∫(sinx/cosx) * (cos^-2 x) dx=∫tgx*(1/cosx)^2 dx=∫tgx*sec^2 x dx=∫ tgx d(tgx)=1/2*tg^2 x + C .可答案是1/2cos^2 x +C 为什么∫( sinx)^3 (cosx)^2dx = −∫(1 −(cosx)^2(cosx)^2d( cos x) d/dx f(x^3)=1/x f(x)导数多少 x=a(θ-sinθ) y=a(1-cosθ)x=a(θ-sinθ),y=a(1-cosθ).求d^2y/dx^2.dy/dx=cotθ/2,d^2y/dx^2=d/dx*dy/dx=d（dy/dx)/dθ*dθ/dx=d(dy/dx)/dθ*1/dx/dθ= 我想问哈d^2y/dx^2那后面d（dy/dx)/dθ*dθ/dx=d(dy/dx)/dθ*1/dx/dθz这两步是如何化解的. ∫cos(x^3)dx=不是∫(cosx)^3dx=