1.

Find the value of:(1+cos""(pi)/(8))(1+cos""(3pi)/(8))(1+cos""(5pi)/(8))(1+cos""(7pi)/(8))=?

Answer»

(a)`(1)/(4)`
(B)`(1)/(2)`
(C)`(1)/(6)`
(d)`(1)/(8)`

Answer :A


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