$\tan ^{-1}(-1)$ 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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यदि $\lim _{x \rightarrow 0} \frac{\sin ^{-1} x - \tan ^{-1} x}{3 x^{3}}$,$L$ के बराबर है,तो $(6L + 1)$ का मान ज्ञात कीजिए।

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