Im reviewing for an exam and cant figure out this question..

what is y' of x^2/2 + 2/x^2 +pi (not sure pi symbol on here)

I know that pi is a constant so its prime is 0, and because this is an old test I know the answer is x^4-4/x^3, getting to that is another problem

the second term i changed to 2x^-2, which gives me the x^3 in the bottom of the answer, but i cant figure this out.

Another that is stumping me is y' of (1+2x)e^3x

Any help?