Exhaustive set of points where f(x) = x|x| is differentiable, is
Answer & explanation
Correct answer: option 4
$f(x)=\left\{\begin{array}{c}x^2, &x \geq 0 \\ -x^2, &x<0\end{array}\right.$
Graph of f(x) indicates that f(x) is differentiable for (–∞, ∞)
