解sin(x/2)-cos(x/2)=1
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
求证(cos^2 x-sin^2 x)(cos^4 x+sin^4 x)+1/4 sin 2x sin 4x=cos 2
证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)
2cos x (sin x -cos x)+1
求导f(x) = cos(3x) * cos(2x) + sin(3x) * sin(2x).
已知f(x)=sin(x/2) + cos(x/2) +[cos(x/2)]^2-1/2
化简f(x)=2cos(x/2)·(sin(x/2)+cos(x/2))-1
已知函数f(x)=2Cos x(Sin x-Cos x)+1
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
5sin^2(X)+sin(2X)-cos^2(X)=1, 求解X
求导y=(1+sin^2 x)/(cos(x^2))
sin(x+1/2π)=cosx?还是cos-x