$\tan ^{-1} x + \tan ^{-1} y = c$ is the general solution of the differential equation:

  • A
    $\frac{dy}{dx} = -\left(\frac{1+y^2}{1+x^2}\right)$
  • B
    $\frac{dy}{dx} = \left(\frac{1+y^2}{1+x^2}\right)$
  • C
    $\frac{dy}{dx} = -\left(\frac{1+x^2}{1+y^2}\right)$
  • D
    $\frac{dy}{dx} = \left(\frac{1+x^2}{1+y^2}\right)$

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