Find the domain of the following y = ...

Find the domain of the following ` y = tan^(-1) ( sqrt (x^(2) - 1)) `

A

`(-infty,-2]cup[1, infty)`

B

`(-infty,-1]`

C

`(-infty,-1]cup[2, infty)`

D

`(-infty,-1]cup[1, infty)`

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The correct Answer is:

D

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