1.

LetF(x)=(1+sin(pi/(2k))(1+sin(k-1)pi/(2k))(1+sin(2k+1)pi/(2k))(1+sin(3k-1)pi/(2k)). The value ofF(1)+F(2)+F(3) is equal to

Answer»

`(3)/(16)`
`(1)/(4)`
`(5)/(16)`
`(7)/(16)`

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