The value of \( \lim _{x \rightarrow 0} \frac{\sqrt{1-x^{2}}-\sqrt{...

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The value of \( \lim _{x \rightarrow 0} \frac{\sqrt{1-x^{2}}-\sqrt{1+x^{2}}}{x^{2}} \) is
\( \mathrm{P} \)
(a) 1
(b) \( -1 \)
(c) \( -2 \)
(d) 0
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