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Solve 5 cos 2 theta+2 "cos"^(2) theta/2 ...

Solve `5 cos 2 theta+2 "cos"^(2) theta/2 +1=0, -pi lt theta lt pi`.

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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