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

  • A
    $\frac{e + 1}{e - 1}$
  • B
    $\frac{e - 1}{e + 1}$
  • C
    $\frac{e^2 + 1}{e^2 - 1}$
  • D
    $\frac{e^2 - 1}{e^2 + 1}$

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$1.5 + \frac{2.6}{1!} + \frac{3.7}{2!} + \frac{4.8}{3!} + \dots$ का मान ज्ञात कीजिए।

$\frac{1-2x-x^2}{e^{-x}}$ के विस्तार में $x^k$ का गुणांक क्या है?

यदि $y = 1 + \frac{x}{1!} + \frac{x^2}{2!} + \frac{x^3}{3!} + \dots \infty$ है,तो $x = $

अनंत श्रेणी $\frac{1^{2}+2^{2}}{3 !} + \frac{1^{2}+2^{2}+3^{2}}{4 !} + \frac{1^{2}+2^{2}+3^{2}+4^{2}}{5 !} + \dots$ का मान ज्ञात कीजिए।

यदि $\cosh (x-\log 3)=\sinh x$ है,तो $x=$

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