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cos2theta = (sqrt(2)+1)(costheta -1/sqrt...

`cos2theta = (sqrt(2)+1)(costheta -1/sqrt(2))`

A

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

B

`2npipm(pi)/(4)`

C

`2npi-(pi)/(4)`

D

none of these

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The correct Answer is:
B
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