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The differential equation of the ellipse...

The differential equation of the ellipse `(x^2)/(a^2)+(y^2)/(b^2)=C` is a. `y^(primeprime)/y^(prime)+y^(prime)/y-1/x=0` b. `y^(primeprime)/y^(prime)+y^(prime)/y+1/x=0` c. `y^(primeprime)/y^(prime)-y^(prime)/y-1/x=0` d. none of these

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