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The domain of y=cos^(-1)(x^(2)-4) is...

The domain of `y=cos^(-1)(x^(2)-4)` is

A

[3.5]

B

`[0, pi]`

C

`[ - sqrt5, - sqrt| nn | - sqrt5, sqrt3]`

D

`[- sqrt5, - sqrt3] uu [ sqrt3, sqrt5]`

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