Determine if the function f x x3 is differentiable at x 0 If not identify why O f x x is not differentiable at x 0 because lim x3 does not exist vant O f x x is differentiable at x 0 O f x x is not differentiable at x 0 because f 0 is not defined O f x x is not differentiable at x 0 because f 0 is not defined