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

Prove that `4cos(2pi)/7dotcospi/7-1=2cos(2pi)/7dot`

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

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

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

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

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(4pi/7)=-1/8,

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