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The differential equation of all conics ...

The differential equation of all conics whose axes coincide with the coordinate axes, is

A

(a)`xyy_(2)+xy_(1)^(2)-yy_(1)=0`

B

(b)`yy_(2)+y_(1)^(2)-yy_(1)=0`

C

(c)`xyy_(2)+(x-y)y_(1)=0`

D

(d)None of these

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The correct Answer is:
A
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