y=sin³(3x+π/4)的导数是什么,

y=sin³(3x+π/4)的导数是什么,

解
y=sin³(3x+π/4)
y'=[sin³(3x+π/4)]'
=3sin²(3x+π/4)cos(3x+π/4)(3x+π/4)'
=9sin²(3x+π/4)cos(3x+π/4)

3cos(3x+PI/4)

复合函数求导

负九塞3x