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