Let .
The derivative of is itself.
Then, apply the chain rule. Multiply by :
Let .
Apply the power rule: goes to
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:
The result of the chain rule is:
Now simplify:
The answer is:
1
-----
x + 5
-e
--------
2
(x + 5)
1
-----
/ 1 \ 5 + x
|2 + -----|*e
\ 5 + x/
------------------
3
(5 + x)