ધારો કે $x \in R$ અને $|x| < 1$. તો $\tanh ^{-1} x=$

  • A
    $\frac{1}{2} \log \left(\frac{1+x}{1-x}\right)$
  • B
    $\frac{1}{2} \log \left(\frac{1-x}{1+x}\right)$
  • C
    $\frac{1}{2} \log \left(x+\sqrt{1-x^2}\right)$
  • D
    $\frac{1}{2} \log \left(x-\sqrt{1-x^2}\right)$

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$\log_e \left( 1 + ax^2 + a^2 + \frac{a}{x^2} \right)$ નું મૂલ્ય શું છે?

જો $|a| < 1$ અને $b = \sum_{k=1}^{\infty} \frac{a^k}{k}$ હોય,તો $a$ ની કિંમત શું થાય?

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