log(x - 1)
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:
1 ----- x - 1
-1 --------- 2 (-1 + x)
2 --------- 3 (-1 + x)