1.

The solution set of cos x gt 0is

Answer»

`[2n pi -(pi)/(2), 2n pi+(pi)/(2)], N in Z`
`(2n pi -(pi)/(2), 2n pi+(pi)/(2)), n in Z`
`[n pi, (n+1) pi], n in Z`
`[NPI+(pi)/(3), (n+1)pi], n in Z`

Answer :B


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