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Prove that : cos(pi/7)cos((2pi)/7) cos((...

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

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

Show that cos(pi/7)cos((2pi)/7)cos((3pi)/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((2pi)/7)+cos((4pi)/7)+cos((6pi)/7)=-1/2

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)

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

Show 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 .