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Let the function f, g and h be defined a...

Let the function `f, g and h` be defined as follows `f(x)={x sin (1/x),` for `-1 le x le 1 and x != 0 g(x)={x^2 sin(1/x),` for `-1 le x le 1 and x != 0, 0,` for `x=0 and h(x)=|x|^3,` for `-1 le x le 1` Which of these functions are differentiable at `x = 0` ?

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