The set of all points, where the function $$f(x) = \sqrt {1 - {e^{ - {x^2}}}} $$ is differentiable, is
- A(0, $$\infty$$)
- B($$-$$ $$\infty$$, $$\infty$$)
- C($$-$$$$\infty$$, 0) $$\cup$$ (0, $$\infty$$)
- D($$-$$1, $$\infty$$)
✓ Correct answer: C
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