श्रेणी $1 + \frac{x^2}{2!} + \frac{x^4}{4!} + \dots$ का अनंत तक योग क्या है?

  • A
    $\frac{e^x - e^{-x}}{2}$
  • B
    $\frac{e^x + e^{-x}}{2}$
  • C
    $\frac{e^{-x} - e^x}{2}$
  • D
    $\frac{-(e^x + e^{-x})}{2}$

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${\left[ {1 + \frac{1}{{2!}} + \frac{1}{{4!}} + \dots \infty } \right]^2} - {\left[ {1 + \frac{1}{{3!}} + \frac{1}{{5!}} + \dots \infty } \right]^2} = $

$(e^x - 1)^2$ के विस्तार में $x^4$ का गुणांक क्या होगा?

$1 - \log 2 + \frac{(\log 2)^2}{2!} - \frac{(\log 2)^3}{3!} + \dots$ का मान है

श्रेणी $\frac{2}{1!} + \frac{6}{2!} + \frac{12}{3!} + \frac{20}{4!} + \dots$ का योग क्या है?

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