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[" If the two pairs of lines "x^(2)-2mXY...

[" If the two pairs of lines "x^(2)-2mXY-Y^(2)=0" and "],[x^(2)-2nXY-Y^(2)=0" are such that one of the them "],[" represents the bisector of the angles between the other,"],[" then "],[[" (a) "mn+1=0," (b) "mn-1=0],[" (c) "(1)/(m)+(1)/(n)=0," (d) "(1)/(m)-(1)/(n)=0]]

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