The equation x^2y^2-9y^2-6x^2y+54 y=0 r...

The equation `x^2y^2-9y^2-6x^2y+54 y=0` represents (a) a pair of straight lines and a circle (b) a pair of straight lines and a parabola (c) a set of four straight lines forming a square (d) none of these

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