1.

What is the differential equation of a family of parabolas with the foci at the origin and axis along the X-axis?

A. 2xy’+ 4y(y’)2-y=0
B. xy’+ y(y’)2-y=0
C. 2xy’+ y(y’)2-y=0
D. 2xy’+2y(y’)2-y=0
Answer» D. 2xy’+2y(y’)2-y=0


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