Show that the family of curves for which the slope of the tangent at any point (x, y) on it is `(x^2+y^2)/(2x y)`, is given by `x^2 -y^2= c x`.

Explanation

To show that the family of curves for which the slope of the tangent at any point \((x, y)\) is given by

\[ \frac{x^2 + y^2}{2xy} \]

is represented by the equation

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