The natural domain of the real valued function defined by \[f(x)=\sqrt – McqOptions

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1.	The natural domain of the real valued function defined by \[f(x)=\sqrt{{{x}^{2}}-1}+\sqrt{{{x}^{2}}+1}\] is [SCRA 1996]
A.	\[1<x<\infty \]
B.	\[-\infty <x<\infty \]
C.	\[-\infty <x<-1\]
D.	\[(-\infty ,\ \infty )-(-1,\ 1)\]
Answer» E.

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