In each of the cases below, give the indicated derivative. You may not need to simplify your answers. d . xcos x 3 a dx b. x tan x 2 x d sin x cosx c. 3 dx x d. If f (0) = l, f '(0) = 2, g(0) = 0 and g'(()) d f (x) x2g(x) dx f (x) + g(x) x=O l, find