InterviewSolution
Saved Bookmarks
| 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 |
|