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cos(pi)/(7)+cos^(2)(pi)/(7)-2cos^(3)(pi)...

cos(pi)/(7)+cos^(2)(pi)/(7)-2cos^(3)(pi)/(7)" is a rational number in "(P)/(4)" form,where pand "q" are integers.Find "(p+q)" ."

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Let the exact value of cos((pi)/(7))+cos^(2)((pi)/(7))-2cos^(3)((pi)/(7)) is a rational number in the form (p)/(q), where p and q are integers.Find (p+q)

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

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

cos((pi)/(7))cos((2pi)/(7))cos((4pi)/(7))= ………..

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

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

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

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

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

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