PLEASE HELP WITH DERIVATIVES FULL ANSWER EXPLANATIONS PLEASE

1. Determine f' (1;) for f (x) = sin (Etan(cosx)) 2. a) Given that h(x) = fo)g(x), and the following values, determine g'Cl). b) Can any value(s) of a be selected. such that f(x) = Jar: 4 has a tangent of slope l at x = 4 '3' 3. Show that the functions f (x) = cos 2x and 9(1) = Zenszx have the same derivative, but no common tangents