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43.sin(pi)/(7)sin(2 pi)/(7)sin(3 pi)/(7)...

43.sin(pi)/(7)sin(2 pi)/(7)sin(3 pi)/(7)=sin(4 pi)/(7)sin(5 pi)/(7)sin(6 pi)/(7)=

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