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[" 5.Torrais "(7 pi)/(3 pi)" anfrom: "],...

[" 5.Torrais "(7 pi)/(3 pi)" anfrom: "],[[" (1) "x^(3)-2x^(2)-x+2," (ii) "x^(3)-3x^(2)-9x-5]]

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2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) = 3/2

2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) = 3/2

2 sin ^(2) "" (pi)/(6) + cosec ^(2) "" (7pi)/(6) cos ^(2) "" (pi)/(3) = 3/2

(sin (3 (pi) / (7)) cos (4 (pi) / (7))) / (sin ((pi) / (7)))

Let cos(pi)/(7),cos(3 pi)/(7),cos(5 pi)/(7) are the roots of equation 8x^(3)-4x^(2)-4x+1=0 Q.The value of sec((pi)/(7))+sec((3 pi)/(7))+sec((5 pi)/(7)) is

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