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

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