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Exhaustive set of points where f(x) = x|x| is differentiable, is |
(−∞, ∞) ∼ {0} (−∞, ∞) ∼ {0} (−∞, ∞) ∼ [−1] (−∞, ∞) |
(−∞, ∞) |
$f(x)=\left\{\begin{array}{c}x^2, &x \geq 0 \\ -x^2, &x<0\end{array}\right.$ Graph of f(x) indicates that f(x) is differentiable for (–∞, ∞)
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