Question

求y=(sinx)^3+sin^3 3x的导数 高二数学 谢谢

Answer 1

y'=3(sinx)^2·(sinx)'+3(sin3x)^2·(sin3x)'

=3(sinx)^2·cosx+3(sin3x)^2·cos3x·(3x)'

=3(sinx)^2·cosx+9(sin3x)^2·cos3x