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" Prove that "4cos(2 pi)/(7)*cos(pi)/(7)...

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

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

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

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