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If A=sin((2pi)/7)+sin((4pi)/7)+sin((8pi)...

If `A=sin((2pi)/7)+sin((4pi)/7)+sin((8pi)/7)` and `B=cos((2pi)/7)+cos((4pi)/7)+cos((8pi)/7)` then `sqrt(A^2+B^2) ` is equal to

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

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

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

The value of cos((2pi)/7)cos((4pi)/7)cos((6pi)/7) is

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