2Let h be a function defined for all x cannot equal zero such that h(4)= -3 and the derivative of h is given by h'(x)= ((x^2)-2)/2 for all x cannot equal zero. a) Find all values of x for which the graph of h has a horizontal tangent, and determine whether h has a local maximum, a local minimum, or neither at each of these values. Justify your answers. b) On what intervals, if any, is the graph of h concave up? Justify your answer. c) Write an equation for the line tangent to the graph of h at x=4. d) Does the line tangent to the graph of h at x=4 lie above or below the graph of h for x>4 ? Why? please show works, thanks alot