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Show that the pairs of straight lines 2x...

Show that the pairs of straight lines `2x^(2)+6xy+y^(2)=0 and 4x^(2)_18xy+y^(2)=0` have the same set of angular bisector.

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Show that the pairs of straight lines 2x^2+6x y+y^2=0 and 4x^2+18 x y+y^2=0 have the same set of angular bisector.

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