Please help and explain thoroughly!!!

(a) Calculate the derivative of F(x) = In ( cos(3.r)). . Hint: let f(x) = Inc, g(x) = cosx, h(x) = 3x and use (1). (b) Calculate the derivative of G(x) = Ve . sin(er) . cos(x + 2) (c) Calculate the derivative of H(x) = (ecos At + In T . cos( VI))?. (d) More generally, show that if f, 9, and h are differentiable, then If (g(h(z)) )]' = f' (g(h(z))) . d' (h(z)) . h'(x). (1) Hint: define G(x) = g(h(x)) and use the usual chain rule for two functions