1.

Form a differential equation of the family of circles having a centre on y-axis and radius 3 units.

Answer»

The equation of the circle passing through the point (O,k)and radius 3 is of the form

(x - 0)2 + (y - k)2 = 9

⇒ x2 + (y + k)2 = 9 .........(i)

Differentiatitng w.r.t to x we get;

2x + 2(y - k) y1 = 0 ⇒ x + (y - k)y1 = 0

⇒ x + (y - k)y1\(\frac{x}{y_1}\)

Substituting in (1) We get ;

⇒ x2 + (\(-\frac{x}{y_1}\))2 = 9 ⇒ x2 + \(\frac{x^2}{{y_1}^2}\) = 9

⇒ x2y12 + x2 = 9y12



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