I'm not sure where to start so I tried to get rid of the fraction.
now I differentiated
which turns into a ridiculously large.. and wrong answer after i simplify
book's answer is
i would agree with matheagle that you can use the product or quotient rule
but it is much more efficient to rewrite your expression into just terms and take the derivative from there.
and
would be quite involved with this problem
hope this helps.