$\tan ^{-1}(-1)$ का मुख्य मान ज्ञात कीजिए।

  • A
    $-\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $-\frac{\pi}{2}$
  • D
    $-\frac{\pi}{4}$

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