MCQ
$x d x+\frac{x d y-y d x}{x^2+y^2}=0$ का हल है :
- A$\frac{x^2}{2}+\tan ^{-1} \frac{x}{y}=k$
- ✓$\frac{x^2}{2}+\tan ^{-1} \frac{y}{x}=k$
- C$\frac{x^2}{2}-\tan ^{-1} \frac{x}{y}=k$
- D$\frac{x^2}{2}-\tan ^{-1} \frac{y}{x}=k$
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