$\sin^{-1} \frac{1}{\sqrt{5}} + \cot^{-1} 3$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{2}$

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यदि $|x|>1$ के लिए, $\tanh ^{-1}\left(\frac{1}{x}\right)+\operatorname{coth}^{-1}(x)=\log _e(f(x))$ है, तो $f(-5)=$

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यदि $0 < x < 1$ है,तो $\cot ^{-1}\left( \frac{2x^2 - 1}{2x\sqrt{1 - x^2}} \right)$ का मान ज्ञात कीजिए।

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