Don't know the steps in finding this derivative.
But the derivative is
The answer is:
/ 3\ / / 3\ \ sin\x / |sin\x / 2 / 3\ | x *|------- + 3*x *cos\x /*log(x)| \ x /
/ 2 \ / 3\ |/ / 3\ \ / 3\ | sin\x / ||sin\x / 2 / 3\ | sin\x / / 3\ 4 / 3\ / 3\ | x *||------- + 3*x *cos\x /*log(x)| - ------- + 6*x*cos\x / - 9*x *log(x)*sin\x / + 6*x*cos\x /*log(x)| |\ x / 2 | \ x /
/ 3 \ / 3\ |/ / 3\ \ / / 3\ \ / / 3\ \ / 3\ | sin\x / ||sin\x / 2 / 3\ | / 3\ 3 / 3\ |sin\x / 2 / 3\ | |sin\x / / 3\ / 3\ 4 / 3\| 2*sin\x / / 3\ 3 / 3\ 6 / 3\ | x *||------- + 3*x *cos\x /*log(x)| + 9*cos\x / - 27*x *sin\x / - 3*|------- + 3*x *cos\x /*log(x)|*|------- - 6*x*cos\x / - 6*x*cos\x /*log(x) + 9*x *log(x)*sin\x /| + --------- + 6*cos\x /*log(x) - 54*x *log(x)*sin\x / - 27*x *cos\x /*log(x)| |\ x / \ x / | 2 | 3 | \ \ x / x /