$\frac{e^{5x} + e^x}{e^{3x}}$ के विस्तार में,$x^4$ का गुणांक क्या है?

  • A
    $-6/5$
  • B
    $4/3$
  • C
    $-4/3$
  • D
    इनमें से कोई नहीं

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

$\frac{1^2 \cdot 2}{1!} + \frac{2^2 \cdot 3}{2!} + \frac{3^2 \cdot 4}{3!} + \dots \infty = $ ($e$ में)

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

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

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

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