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

  • A
    $\frac{3}{2}$
  • B
    $\frac{-2}{3}$
  • C
    $\frac{2}{3}$
  • D
    $\frac{1}{3}$

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समीकरण $2 \operatorname{Cos}^{-1} x + \operatorname{Sin}^{-1} x = \frac{11 \pi}{6}$ के हलों की संख्या है

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