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The solution set of (5+4 "cos" theta) (2...

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

A

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

B

`{pi//3, pi}`

C

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

D

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

Text Solution

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The correct Answer is:
C
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