cos^2 ""(pi)/(8) + cos ^2 ""(3 pi)/(8...

`cos^2 ""(pi)/(8) + cos ^2 ""(3 pi)/(8) + cos ^2 ""(5 pi)/(8) + cos ^2 ""(7 pi)/(8)` is

A

1

B

2

C

`-2`

D

`sqrt(2)`

Verified by Experts

The correct Answer is:

B

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