X y Suppose w = - + where y F Z x = e, y = 2 + sin(2t), and z = 2 + cos(3t). dw as a function of x, y, z, and f. Do not rewrite x, y, and z in terms of t, and do not rewrite e as x. dt 1. Use the chain rule to find dw dt Note: Your answer should be an expression in x, y, z, and t; e.g. "3x - 4y + 2t" 2. Use part 1. to evaluate when t = 0. dw dt