1. (a) Evaluate / cos (2x) dx by guessing an antiderivative of cos (22). Ja (c) Evaluate / (b) Find a formula for cos(kx) dic where k is a nonzero constant. 10 cos3 (50) - 4 cos? (5x) +1 cos2 (5:) 2. A rock is dropped from the top of a building and hits the ground at a velocity of –72ft/sec. If the acceleration due to gravity is – 32ft/sec², what is the height of the building? ·