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The set of points, where the function is differentiable in:
The set of points, where the function $f(x) = x |x|$ is differentiable in:
- (a)$(-\infty, \infty)$
- (b)$(-\infty, 0) \cup (0, \infty)$
- (c)$(0, \infty)$
- (d)$[0, \infty)$
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From ISC 2022 Specimen Mathematics Paper 1, question 14.