यदि $y = \tan^{-1}\left( \frac{a\cos x - b\sin x}{b\cos x + a\sin x} \right)$ है,तो $\frac{dy}{dx} = $

  • A
    $2$
  • B
    $-1$
  • C
    $\frac{a}{b}$
  • D
    $0$

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