Differentiate term by term:
Apply the power rule: goes to
The derivative of a constant times a function is the constant times the derivative of the function.
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:
So, the result is:
The result is:
Now simplify:
The answer is:
1 - 4*cos(x)*sin(x)
/ 2 2 \ 4*\sin (x) - cos (x)/