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Let n be a positive integer such that si...

Let n be a positive integer such that `si, pi/(2n)+cos, pi/(2n)= sqrt(n)/2` then (A) `n=6` (B) `n=1,2,3,….8` (C) `n=5` (D) none of these

A

1,2,3,……8

B

5

C

6

D

none of these

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The correct Answer is:
C
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