1.

The solution set of (5+4Costheta)(2costheta+1)=0 in the interval [0,2pi] is

Answer»

`{(pi)/(3),(2PI)/(3)}`
`{(2pi)/(3),pi}`
`{(2pi)/(3),(4PI)/(3)}`
`{(2pi)/(3),(5PI)/(3)}`

Answer :C


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