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

Let `P(k)=(1+cospi/(4k))` `(1+cos((2k-1)pi)/(4k))` `(1+cos((2k+1)pi)/(4k))(1+cos((4k-1)pi)/(4k))dotT h e n` `P(3)=1/(16)` (b) `P(4)=(2-sqrt(2))/(16)` `P(5)=(3-sqrt(5))/(32)` (d) `P(6)(2-sqrt(3))/(16)`

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a) `(3-sqrt(5))/32`, b) `(2-sqrt(3))/16`
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