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[" If "cos(pi)/(7),cos(3 pi)/(7),cos(5 p...

[" If "cos(pi)/(7),cos(3 pi)/(7),cos(5 pi)/(7)" are the roots of the "],[" equationequation "8x^(3)-4x^(2)-4x+1=0" then the value of "],[cos(pi)/(14)cos(3 pi)/(14)cos(5 pi)/(14)" is "----]

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