$A$ curve passes through the point $\left(1, \frac{\pi}{6}\right)$. Let the slope of the curve at each point $(x, y)$ be given by $\frac{dy}{dx} = \frac{y}{x} + \sec \left(\frac{y}{x}\right)$,where $x > 0$. Then the equation of the curve is:

  • A
    $\sin \left(\frac{y}{x}\right) = \log x + \frac{1}{2}$
  • B
    $\operatorname{cosec}\left(\frac{y}{x}\right) = \log x + 2$
  • C
    $\cos \left(\frac{2y}{x}\right) = \log x + \frac{1}{2}$
  • D
    $\sec \left(\frac{2y}{x}\right) = \log x + 2$

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