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If f(x)=log(cosx), then domain f=...

If `f(x)=log(cosx), ` then domain `f=`

A

`{x:2npi-pi//2 lt xlt 2npi+pi//2, n in Z}`

B

`{x:2npi lt x lt (2npi+1)pi n in Z}`

C

`{x:x in (-oo, oo)}`

D

none

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