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If cos 2 theta =(sqrt(2)+1)( cos theta ...

If ` cos 2 theta =(sqrt(2)+1)( cos theta -(1)/(sqrt(2)))`, then the value of ` theta ` is

A

`2 n pi +(pi)/(4)`

B

`2n pi pm (pi)/4`

C

`2npi -(pi)/4`

D

None of these

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The correct Answer is:
B
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