Let .
The derivative of is .
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:
/ 3 \ | 3*x | 3*x*|2 - ------| | 3| \ 1 + x / ---------------- 3 1 + x
/ 3 6 \ | 9*x 9*x | 6*|1 - ------ + ---------| | 3 2| | 1 + x / 3\ | \ \1 + x / / -------------------------- 3 1 + x