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[" 6.If the pairs of lines "x^(2)+2xy+ay...

[" 6.If the pairs of lines "x^(2)+2xy+ay^(2)=0" and "ax^(2)+2xy],[+y^(2)=0" have exactly one line in common,then the joint "],[" equation of the other two lines is given by "],[[" (1) "3x^(2)+8xy-3y^(2)=0," (2) "3x^(2)+10xy+3y^(2)=0],[" (3) "y^(2)+2xy-3x^(2)=0," (4) "x^(2)+2xy-3y^(2)=0]]

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