1. The problem statement, all variables and given/known data http://i.minus.com/jJQzZXoxXFqEB.png [Broken] 2. Relevant equations (b-a)/n = Δx 3. The attempt at a solution I know how to express the sum as an integral .. almost. It is the integral of cos(2+x) with respect to x. However, what are my bounds of integration? I know that b-a must equal 1, but I don't think I can pick any arbitrary b and a that are just one counting number apart, right?