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

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

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