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Show that: cos\ (2pi)/7+ cos\ (4pi)/7+co...

Show that: `cos\ (2pi)/7+ cos\ (4pi)/7+cos\ (6pi)/7 =- 1/2`

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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

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

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

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

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

Prove that : cos(pi/7)cos((2pi)/7) cos((3pi)/7)=1/8

Find the value of cos(2pi)/7+cos(4pi)/7+cos(6pi)/7

Find the value of cos(2pi)/7+cos(4pi)/7+cos(6pi)/7