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Form the differentialequation of the family of circles touching the y-axis at origin. |
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Answer» If the circles touches `Y`-axis at origin then its centre will lie on `X`-axis. `:.` equation of circle `(x-h)^(2)+(y-0)^(2)=h^(2)` `implies x^(2)+y^(2)-2hx=0`……..`(1)` differentiate w.r.t.x, `2x+2y(dy)/(dx)-2h=0` `implies 2h=2x+2y(dy)/(dx)` Put this value in equation `(1)`, `x^(2)+y^(2)-x(2x+2y(dy)/(dx))=0` `implies y^(2)-x^(2)-2xy(dy)/(dx)=0` |
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