Okay so the question goes
For x in [-pi/2,pi/2], define
Find I(x) by showing that dI/dx = -1 and that I(pi/4)=0.
I have the done the first part, ie showing that dI/dx= -1 and that I(pi/4)=0. However, I can't figure out how to use my answer to that part to find I(x). Can anyone help?