Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Let .
The derivative of is .
Then, apply the chain rule. Multiply by :
Differentiate term by term:
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
The derivative of the constant is zero.
The result is:
The result of the chain rule is:
The result of the chain rule is:
Now simplify:
The answer is:
3
12*log (3*x + 1)
----------------
3*x + 1
2
36*log (1 + 3*x)*(3 - log(1 + 3*x))
-----------------------------------
2
(1 + 3*x)
/ 2 \
108*\6 - 9*log(1 + 3*x) + 2*log (1 + 3*x)/*log(1 + 3*x)
-------------------------------------------------------
3
(1 + 3*x)