यदि $S = \frac{1}{1 \times 2} - \frac{1}{2 \times 3} + \frac{1}{3 \times 4} - \frac{1}{4 \times 5} + \dots + \infty$ है,तो $e^S = $

  • A
    $\log_e \left( \frac{4}{e} \right)$
  • B
    $\frac{4}{e}$
  • C
    $\log_e \left( \frac{e}{4} \right)$
  • D
    $\frac{e}{4}$

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

यदि $\log (1 - x + {x^2}) = {a_1}x + {a_2}{x^2} + {a_3}{x^3} + \dots$ है,तो ${a_3} + {a_6} + {a_9} + \dots$ का मान ज्ञात कीजिए।

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