1.

(1+cos""(pi)/(8))(1+cos""(2pi)/(8))(1+cos""(3pi)/(8))(1+cos""(4pi)/(8))(1+cos""(5pi)/(8))(1+cos""(6pi)/(8))(1+cos""(7pi)/(8))=

Answer»

`(1)/(8)`
`(1)/(16)`
`(1)/(32)`
`(1)/(64)`

Answer :B


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