1. The problem statement, all variables and given/known data Evaluate ∫cos(2z)dz from pi/2 to pi/2+i 2. Relevant equations 3. The attempt at a solution I know the cos function is entire, thus independent of path and I just need to evaluate the end points. I also know when you integrate you get (1/2)sin2z. My only question is for finishing the problem, how do I evaluate sin(pi/2+i). Its the i that is throwing me off.