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The domain of the function f(x)=sqrt(cos...

The domain of the function `f(x)=sqrt(cos x)` is

A

`[(3pi)/2,2pi]`

B

`[0, pi/2]`

C

`[-pi/2,pi/2]`

D

`[0,pi/2] cup [(3pi)/2, 2pi]`

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A, B, C, D
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