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(1+cos (pi//8))(1+cos(3pi//8))(1+cos(5pi...

`(1+cos (pi//8))(1+cos(3pi//8))(1+cos(5pi//8))` (1+cos(7pi//8))=`

A

`1//2`

B

`cos(pi//8)`

C

`1//8`

D

`(1+sqrt(2))//2sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
c
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