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Let y(x) be the solution curve of the differential equation x(1+y2)dx−y(1+x2)dy=0x(1+y^2)dx - y(1+x^2)dy = 0 and it passes through the point (0, 1), then

Solution

✅ Correct Option: 1

Separating, x dx1+x2=y dy1+y2\frac{x\,dx}{1+x^2}=\frac{y\,dy}{1+y^2}.

Integrating gives 12log⁡(1+x2)=12log⁡(1+y2)+log⁡k\frac12\log(1+x^2)=\frac12\log(1+y^2)+\log k, so 1+y2=c(1+x2)1+y^2=c(1+x^2).

At (0,1)(0,1): 2=c2=c. Hence y2=2x2+1y^2=2x^2+1.

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