1.

Let P(k) = (1+"cos"(pi)/(4k))(1+"cos"((2k-1)pi)/(4k))(1 + "cos" ((2k+1)pi)/(4k))(1+"cos"((4k-1)pi)/(4k)). Then

Answer»

`P(3) = (1)/(16)`
`P(4) = (2- sqrt(2))/(16)`
`P(5) = (3 - sqrt(5))/(32)`
`P(6) = (2 - sqrt(3))/(16)`

Answer :A::B::C::D


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