फलन को सरलतम रूप में लिखिए: $\tan ^{-1}\left(\frac{\cos x-\sin x}{\cos x+\sin x}\right)$

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

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