(1 point) Find the derivative of f(x) = 7 - cosh(x)/7 + cosh(x) f'(x) = (1 point) Find the derivative of f(t) = ln(sinh(t)). f'(t) = (1 point) Find the derivative of f(x) = sinh(cosh(x)). f'(x_=___. Find the derivative of f(x) = x^2 sinh-l(6x). f'(x) =