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