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

Let n be a positive integer such that `sin(pi/2^n)+cos(pi/2^n)=sqrt n/2` ,then

A

`4ltnlt8`

B

`4 ltn lt=8`

C

`4 lt=n lt 8`

D

`6 lt=n lt=8.`

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The correct Answer is:
B
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