यदि $-\frac{\pi}{2} < \theta < \frac{\pi}{2}$ है,तो $\log \left(\tan \left(\frac{\pi}{4}+\frac{\theta}{2}\right)\right)=$

  • A
    $\tanh ^{-1}\left(\tan \frac{\theta}{2}\right)$
  • B
    $2 \tanh ^{-1}\left(\tan \frac{\theta}{2}\right)$
  • C
    $\operatorname{coth}^{-1}\left(\tan \frac{\theta}{2}\right)$
  • D
    $2 \operatorname{coth}^{-1}\left(\tan \frac{\theta}{2}\right)$

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श्रेणी $x \log _e a + \frac{x^3}{3!} (\log _e a)^3 + \frac{x^5}{5!} (\log _e a)^5 + \dots$ का मान क्या है?

$\frac{1}{3} + \frac{1}{2 \cdot 3^2} + \frac{1}{3 \cdot 3^3} + \frac{1}{4 \cdot 3^4} + \dots \infty = $

$\frac{1}{1 \cdot 2 \cdot 3} + \frac{1}{3 \cdot 4 \cdot 5} + \frac{1}{5 \cdot 6 \cdot 7} + \dots \infty = $

श्रेणी का योग ज्ञात कीजिए: $\log_e \frac{4}{5} + \frac{1}{4} - \frac{1}{2} \left( \frac{1}{4} \right)^2 + \frac{1}{3} \left( \frac{1}{4} \right)^3 - \dots$

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