Let .
The derivative of is .
Then, apply the chain rule. Multiply by :
Differentiate term by term:
Apply the power rule: goes to
Apply the power rule: goes to
The result is:
The result of the chain rule is:
Now simplify:
The answer is:
2 / 3\ \1 + 4*x / 12*x - ----------- 2 / 3\ x *\1 + x / ------------------ 3 1 + x
/ 3 \ | / 3\ / 3\ | | 18*\1 + 4*x / \1 + 4*x / | 2*|12 - ------------- + ------------| | 3 2| | 1 + x 3 / 3\ | \ x *\1 + x / / ------------------------------------- 3 1 + x