1.

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

Answer»

`P(3)=1/16`
`p(4)=(2-sqrt2)/16`
`P(5)=(3-sqrt5)/32`
`P(6)=(2-sqrt3)/16`

ANSWER :A::B::C::D


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