`cos(2pi/7)cos(4pi/7)*cos(6pi/7)`

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Prove that cos((2pi)/7)cos((4pi)/7)cos((8pi)/7)=1/8

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Prove that cos((2pi)/7) cos((4pi)/7) cos((8pi)/7) =1/8

Prove that: cos(pi)/(7)cos(2 pi)/(7)cos(4 pi)/(7)=-(1)/(8)

prove that cos2(pi)/(7)+cos4(pi)/(7)+cos6(pi)/(7)=-(1)/(2)

The value of cos(2pi)/7cos(4pi)/7cos6/7pi is a. -1//2 b. \ 1//2 c. \ 1//4 d. 1//8

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