fun-lim

Question: The natural domain of the real valued function defined by $f(x)=\sqrt{{{x}^{2}}-1}+\sqrt{{{x}^{2}}+1}$ is



1) $1 < x < \infty $
2) $-\infty < x < \infty $
3) $-\infty < x < -1$
4) $(-\infty ,\ \infty )-(-1,\ 1)$
Solution: Explanation: No Explanation
Functions

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