[" If "x(1),x(2),x(3),x(4)" are roots of...

[" If "x_(1),x_(2),x_(3),x_(4)" are roots of the "],[" quadratic equation "x^(4)-x^(3)sin2 beta+],[x^(2)cos2 beta-x cos beta-sin beta=0" then "],[tan^(-1)x_(1)+tan^(-1)x_(2)+tan^(-1)x_(3)+tan^(-1)],[x_(4)=],[" 1) "Pi],[" 2) "pi/2-beta],[" 3) "Pi-beta],[" 4) "-beta]

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[" If "x_(1),x_(2),x_(3),x_(4)" are roots of the "],[" quadratic equation "x^(4)-x^(3)sin2 beta+],[x^(2)cos2 beta-x cos beta-sin beta=0" then "],[tan^(-1)x_(1)+tan^(-1)x_(2)+tan^(-1)x_(3)+tan^(-1)],[x_(4)=],[" 1) "Pi],[" 2) "pi/2-beta],[" 3) "Pi-beta],[" 4) "-beta]

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