1. The problem statement, all variables and given/known data Find the arclength of the curve given by y= integral from -pi/2 to x of sqrt(cost)dt. X is restricted between -pi/2 and pi/2. 2. Relevant equations L = Integral from a to b of sqrt((dy/dx)^2 + 1)dx L = Integral from a to b of sqrt((dy/dt)^2 + (dx/dt)^2)dt 3. The attempt at a solution I'm not even sure how to start this problem since integral of sqrt(cost) has no simple function representing it. Can somebody please give me some direction?