7.(a) Show that the following function is continuous at c 0 but is not differentiable at…

7.(a) Show that the following function is continuous at c 0 but is not differentiable at c = 0: x cos), ifx 0 f(x) 0, ifx 0 (b) Show that the following function is differentiable at c 0: (x2 cos ), ifx 0 0, if x 0 (x) =