设f(x)为可导函数,y=sin{f[sinf(x)]} dy/dx=

dy/dx=cos{f[sinf(x)]}*{f[sinf(x)]}'=cos{f[sinf(x)]}*f‘[sinf(x)]*[sinf(x)]’=cos{f[sinf(x)]}*f‘[sinf(x)]*cosf(x)*f'(x)