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