$\tan ^{-1}\left(\frac{x}{y}\right)-\tan ^{-1}\left(\frac{x-y}{x+y}\right)$ (जहाँ,$x, y>0$) का मान क्या है?

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

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