3. Consider the function f(x) = Vx , x > 0. Use the limit definition of the derivative to compute the formula for f' (x) f ( x ) = Vx f ( x ) = J ( x th ) = J ( xth ) - Jx 4. Consider the graph of f (x) = Vx below. Is f (x) differentiable at x = 0? If so, what is f'(0) and if not, explain what is happening to the instantaneous rate of change for f (x) as x approaches zero