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If 5 cos 2 theta + 2 cos^(2) (theta//2) ...

If `5 cos 2 theta + 2 cos^(2) (theta//2) + 1 = 0`

A

`pi//3`

B

`pi//3, cos^(-1)(3//5)`

C

`cos^(-1)(3//5)`

D

`pi//3, pi - cos^(-1)(3//5)`

Text Solution

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The correct Answer is:
D
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