Let .
The derivative of sine is cosine:
Then, apply the chain rule. Multiply by :
Differentiate term by term:
Apply the power rule: goes to
The derivative of the constant is zero.
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
/ 2 / 2\ / 2\\ 2*\- 2*x *sin\1 + x / + cos\1 + x //
/ / 2\ 2 / 2\\ -4*x*\3*sin\1 + x / + 2*x *cos\1 + x //