1. The problem statement, all variables and given/known data Ok, Im given a integral f(x) with a lower limit 0 zero and an upper limit of g(x). Its 1/(1+t^3)^(1/2)dt g(x) is the integral from 0 to cosx of (1+sin(t^2))dt. I need to find f '(pi/2). Any suggestions on where to start? This is calc one. I can find g '(x) but I dont think thats what is require. I am not sure however on how to actually integrate it. f '(x) would be 1/(1+(g(x))^3) but I Dont know what to do with g(x). 2. Relevant equations find f'(pi/2) 3. The attempt at a solution f '(x) would be 1/(1+(g(x))^3) but I Dont know what to do with g(x).