Question
Find the differential equation by eliminating arbitrary constant from the relation $x^2+y^2=2 a x$.

Answer

$
x^2+y^2=2 a x
$
Differentiating both sides w.r.t. $x$, we get
$
2 x +2 y \frac{d y}{d x}=2 a
$
Substituting value of $2 a$ in equation (1), we get
$
\begin{aligned}
& x ^2+ y ^2=\left[2 x +2 y \frac{d y}{d x}\right] x =2 x ^2+2 xy \frac{d y}{d x} \\
& \therefore 2 xy \frac{d y}{d x}= y ^2- x ^2 \text { is the required D.E. }
\end{aligned}
$

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