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The curve amongst the family of curves represented by the differential equation, (x 2 – y 2 )dx + 2xy dy = 0 which passes through (1, 1) is

1. a circle with centre on the y-axis
2. an ellipse with major axis along the y-axis
3. a circle with centre on the x-axis
4. a hyperbola with tr

Correct answer: a circle with centre on the x-axis

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