y=sin^2xcos2x (y等于sin的平方x cos2x )的导数
问题描述:
y=sin^2xcos2x (y等于sin的平方x cos2x )的导数
答
y'=2sinx*cosxcos2x+sin^2x*(-sin2x)*(-2x)'
=sin2xcos2x+2sin^2xsin2x
=1/2sin4x+2sin^2xsin2x