Don't know the steps in finding this derivative.
But the derivative is
Now simplify:
The answer is:
y - 2 /1 log(y)\ y *|- + ------| \2 2 /
y - 2 / 2 2\ y *|(1 + log(y)) + -| \ y/ ---------------------- 4
y - 2 / 3 4 6*(1 + log(y))\ y *|(1 + log(y)) - -- + --------------| | 2 y | \ y / ---------------------------------------- 8