求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).

求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x). f(x)=cos(2x-派/3)-2sin x*cos (派/2+x) 已知函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x 已知函数f(x)=cos(2x-π\3)+sin²x-cos²x 已知函数f(x)=sin平方+根号3 sin x cos x+2cos平方x,x∈R 化简!f(x)=sin(pai-x)cos(3/2pai+x)+sin(pai+x)sin(3/2pai-x) 求导y=(1+sin^2 x)/(cos(x^2)) 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4 求导：f（x）=sinkx*sin^k(x)+coskx*cos^k(x)=cos^k(2x) f(x)=2cos*sin(x+π/3)-^3sin^2x+sinx*cosx 已知函数f(x)= [sin(2π-x)sin(π+x)cos(-x-π)] ／[2cos(π-x)sin(3π-x)]