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[" If "tan theta(1),tan theta(2),tan the...

[" If "tan theta_(1),tan theta_(2),tan theta_(3)" and "tan theta_(4)" are the roots of the "],[" equation "],[x^(4)-x^(3)sin2 beta+x^(2)cos2 beta-x cos beta-sin beta=0," then "],[tan(theta_(1)+theta_(2)+theta_(3)+theta_(4))" is equal to "]

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