The solution set of (5+4costheta)(2costh...

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

A

`{pi/3, (2pi)/3}`

B

`{pi.3, pi}`

C

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

D

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

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The correct Answer is:

C

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