2 sin (x)*(cos(x) + 1)
d / 2 \ --\sin (x)*(cos(x) + 1)/ dx
Apply the product rule:
; to find :
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
The derivative of sine is cosine:
The result of the chain rule is:
; to find :
Differentiate term by term:
The derivative of cosine is negative sine:
The derivative of the constant is zero.
The result is:
The result is:
Now simplify:
The answer is:
3 - sin (x) + 2*(cos(x) + 1)*cos(x)*sin(x)
/ / 2 2 \ 2 \ -\2*(1 + cos(x))*\sin (x) - cos (x)/ + 5*sin (x)*cos(x)/
/ 2 2 \ \- 12*cos (x) + 7*sin (x) - 8*(1 + cos(x))*cos(x)/*sin(x)