12. which of the following maps are differentiable everywhere? (a) f(x) = [x|' x, x er b) f:r>r such that x)-s(y) slx - for all x and ye r (c) f(x)=x'sin when x

12. Which of the following maps are differentiable everywhere? (a) f(x) = [x|' x, x eR b) f:R>R such that x)-S(y) slx - for all x and ye R (c) f(x)=X'sin when x#0 and f(0) = 0