Consider the Riemann sum of the function f(x) = cos(2x) on the interval (0,pi/2) with

n = 3 equal size subintervals, that uses the right endpoint of each subinterval as the sample

point.

a) Write down the above sum using sigma notation; do not simplify or evaluate.

b) Evaluate the sum; simplify, but do not approximate.

Please help my teacher spent like 5 minutes on this in class and now its on our assignment.

Thanks in advance.