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The value of (1+cos (pi)/(8))(1+cos (3 p...

The value of `(1+cos (pi)/(8))(1+cos (3 pi)/(8))(1+cos (5 pi)/(8))(1+cos (7 pi)/(8))` is

A

`(1)/(2)`

B

`cos (pi)/(8)`

C

`(1)/(8)`

D

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

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