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Questions  >>  CBSE XII  >>  Math  >>  Differential Equations
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Form the differential equation of the family of circles having centre on $y$-axis and radius $3$ units.

$\begin{array}{1 1} (A)\;(x^2 - 9)(y')^2 + x^2 = 0 \\ (B)\;(x^2 - 9)(y')^2 - x^2 = 0 \\ (C)\;(x^2 - 9)(y')^2 + x^3 = 0 \\ (D)\;(x^2 - 9)(y')^2 + x^4 = 0 \end{array} $

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