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सिद्ध कीजिए कि - "cos"(pi)/(7)"cos"(2pi...

सिद्ध कीजिए कि - `"cos"(pi)/(7)"cos"(2pi)/(7)"cos"(4pi)/(7)=-(1)/(8)`.

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

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

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

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

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

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

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

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

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