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Q)

The set of points where the function $f(x)=\sqrt{1-e^{-x^2}}$ is differentiable is

$\begin{array}{1 1}(a)\;(-\infty,\infty)&(b)\;(-\infty,0)\cup (0,\infty)\\(c)\;(-1,\infty)&(d)\;\text{None of these}\end{array}$

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