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[" The three roots of equation "x^(4)-px...

[" The three roots of equation "x^(4)-px^(3)+qx^(2)-rx+Delta=0," where "p,q,r,a in R" and "a<0" are tan "A,tan B" and tan "C" where "A,B,C" are "],[" angles of a triangle.Then the fourth root of the equation can be equal to "]

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