If h(x) = x cos x, find h'(x) and h''(x).
a) h'(x) = cos x - x sin x, h''(x) = -2sin x - xcos x
b) h'(x) = cos x + x sin x, h''(x) = 2sin x - xcos x
c) h'(x) = cos x - x sin x, h''(x) = 2sin x - xcos x
d) h'(x) = sin x + x cos x, h''(x) = -2sin x - xcos x