Don't know the steps in finding this derivative.
But the derivative is
The answer is:
/ 2 \ sin(x) | 2 2 cos (x) | sin (x)*|-sin(x) + (1 + log(sin(x))) *cos (x) + ------- - log(sin(x))*sin(x)| \ sin(x) /
/ 2 / 2 \\ sin(x) | 3 2 cos (x) | cos (x) || sin (x)*|-4 - log(sin(x)) + (1 + log(sin(x))) *cos (x) - ------- - 3*(1 + log(sin(x)))*|log(sin(x))*sin(x) - ------- + sin(x)||*cos(x) | 2 \ sin(x) /| \ sin (x) /