Find the derivative of each function. (a) F₁(x) = 9(x4 + 6)5 4 F₁'(x) = (b) F2(x) = 9 4(x4 + 6)5 F₂'(x) = (c) F3(x) = (9x4 + 6)5 4 F3'(x) = 9 (d) F4(x): = (4x4 + 6)5 F4'(x) = *