You will still need to apply the Chain Rule
and so on......
Here's how to use the Chain Rule:
You've gotten to
The derivative "with respect to x" of is
We want to differentiate "with respect to x" however.
If we write then we can say we are calculating the derivative of "with respect to x".
But what about
We have to use the Chain Rule for that...
We multiply those 2 derivatives and we can calculate both of them.
Now we replace "u" with it's original expression in x.
by multiplying the derivatives.
The same procedure applies to the 2nd log expression. Then the 2 results need to be subtracted.