(a) Use implicit differentiation to find the derivative of y = cosh 'a (r e [1, too)). (b) Use your result in part (a) to find the derivative of y = cosh(In VI). Sketch the graph of a function f that is continuous on 1, 5] and has the given properties: absolute maximum at 5, absolute minimum at 2, local maximum at 3, local minima at 2 and 4