来自胡家宝的问题
y=cos3次方x求导数啊
y=cos3次方x求导数啊
1回答
2020-05-22 22:59
y=cos3次方x求导数啊
y=cos3次方x求导数啊
{cos^3(3x)}'
=3cos^2(3X){cos(3x)}'
=3cos^2(3X){-sin(3x)}(3x)'
=3cos^2(3X){-sin(3x)}3
=-9sin(3x)cos^2(3x)