来自童华章的问题
y=sin²xcos2x的导数是?
y=sin²xcos2x的导数是?
1回答
2020-05-2013:50
y=sin²xcos2x的导数是?
y=sin²xcos2x的导数是?
∵y=(sinx)^2cos2x,
∴y′
=[(sinx)^2]′cos2x+(sinx)^2(cos2x)′
=2sinxcosxcos2x-2sin2x(sinx)^2.