Find the derivative of the function:

a. $\displaystyle \int

$ $\displaystyle \frac{u^2-1}{u^2+1}dx$

Couldn't get the bounds to come out right, but they are 2x to 3x.

b. $\displaystyle \int

$ $\displaystyle sqrt(t)*sintdt$

from sqrt(x) to $\displaystyle x^3$.

Can someone help with these?