Please show work

Let ((x) = (absolute value of x). a) Consider the limit when h tends to zero, for positive values of h of /( ) f(=) h on one hand, and the limit when h tends to zero, for negative values of h, of on the other, to show that the function f(x) = | does not have a derivative at x = 0 b) Explain the result of a) geometrically in terms of a possible tangent line to the graph at x = 0