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

Let `n` be a positive integer such that `sinpi/(2n)+cospi/(2n)=(sqrt(n))/2dot` Then `6lt=nlt=8` (b) `4

A

`6lenle8`

B

`4ltnlarr8`

C

`4lenle8`

D

`4ltnlt8`

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