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Find the the domain of following functio...

Find the the domain of following functions:
(i) `f(x)=sqrt(x^(2)-5)` (ii) `sin(x^(3)-x)`

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(i) `f(x)=sqrt(x^(2)-5)` is real iff `x^(2)-5ge0`
`implies |x|gesqrt(5)xge-sqrt(5)` or `xgesqrt(5)`
`:.` the domain of `f` is `(-oo,-sqrt(5)]uu[sqrt(5),oo)`
(i) `x^(3)-xepsilonR:.` domain is `xepsilonR`
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