Hi all. I've been having problems with the question below.

find

I've tried two differentiation methods:

**First**
which generally gives me:

I'm not 100% sure about that though. Especially differentiating

(the denominator of

)

__Secondly__
I dont know the name of this differentiation method or how to describe it, but essentially you differentiate as normal - with respect to x, treating y as a constant.

This time, however, also add

whenever you encounter a

. Or is it whenever you differentiate

? Or is it when

is left from differentiating

- as in

was a coefficient of

? As you can see this is where my confusion comes in.

If anyone can confirm or help me with this I would appreciate it. Thanks.