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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)`

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The correct Answer is:
D
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