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प्रश्न
Find the differential equation of the family of concentric circles `x^2 + y^2 = a^2`
उत्तर
Finally of concentric circle is `x^2 + y^2 = a^2`
∴DDifferential w.r.t x
`2x + 2y dy/dx = 0`
`:. y dy/dx + x = 0`
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