Domain of \[f(x)={{({{x}^{2}}-1)}^{-1/2}}\] is [Roorkee 1987]

1.	Domain of \[f(x)={{({{x}^{2}}-1)}^{-1/2}}\] is [Roorkee 1987]
A.	\[(-\infty ,\ -1)\cup (1,\ \infty )\]
B.	\[(-\infty ,\ -1]\cup (1,\ \infty )\]
C.	\[(-\infty ,\ -1]\cup [1,\ \infty )\]
D.	None of these
Answer» B. \[(-\infty ,\ -1]\cup (1,\ \infty )\]

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Domain of \[f(x)={{({{x}^{2}}-1)}^{-1/2}}\] is [Roorkee 1987]

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