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sqrt(2+sqrt(2+2cos 4 theta)), forall 0 l...

`sqrt(2+sqrt(2+2cos 4 theta)), forall 0 lt theta lt pi//4` is

A

`cot (pi)/(8)`

B

`cot(pi)/(16)`

C

2 cos '(theta)'

D

none of these

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The correct Answer is:
C
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