$\tan ^{-1}\left(\frac{x}{y}\right)-\tan ^{-1} \left(\frac{x-y}{x+y}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{4}$
  • B
    $\frac{-3 \pi}{4}$
  • C
    $\frac{\pi}{2}$
  • D
    $\frac{\pi}{3}$

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