1. Let Ln denote the leftendpoint sum using n subintervals and let Rn denote the corresponding rightendpoint sum. Compute the indicated left and right sums for the given functions on the indicated interval. R4 for g{x) = cos(rrx} on [0, 1] 2. Express the following endpoint sum in sigma notation but do not evaluate them. L19 for f(x) = V4 x2 on [2, 2] 3. Express the limit as integral: :1 "Emmi 1 (2052(211'1'1!' )Ax over [0, l] 1: 4. Evaluate the integral using area formula: ff V4 .3:de 5. Show that the average value of sinzf over [0, 217] is equal to H2 Without further calculation, determine whether the average value of sinzt over [0, n1 is also equal to 1l2