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cos (pi/7) cos ((2pi)/(7) ) cos ( (4pi )...

`cos (pi/7) cos ((2pi)/(7) ) cos ( (4pi )/(7) ) =`

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The value of cos (pi)/(7) . cos (2 pi)/(7) . cos (4 pi)/(7) is

cos ((pi) / (7)) cos ((2 pi) / (7)) cos ((4 pi) / (7)) =

cos. (pi)/(7) + cos. (2pi)/(7) + cos. (3pi)/(7) + cos. (4pi)/(7) + cos. (5pi)/(7) + cos. (6pi)/(7)=

Prove that cos ((2pi)/7)+ cos ((4pi)/7) + cos ((6pi)/7) = - 1/2

Prove that cos ((2pi)/7)+ cos ((4pi)/7) + cos ((6pi)/7) = - 1/2

the value of (cos pi)/(7)cos(2(pi)/(7))cos(3(pi)/(7)) is

cos((2pi)/(7))+cos((4pi)/(7))+cos((6pi)/(7))=