Hyperbolic

If f(x) = 9 - cosh x 5 + cosh x then f' (ac) =If f(a) = x cosh 1 2 - 16 then f'(10) =If f(x) = coth 2 + 4 then f' (ac) =If f (x) = tanh 1 4/x then f' (a) =