$\frac{x^2 - y^2}{1!} + \frac{x^4 - y^4}{2!} + \frac{x^6 - y^6}{3!} + \dots \infty = $

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

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$\sum_{k=1}^{\infty} \frac{1}{k !} \left(\sum_{n=1}^k 2^{n-1}\right)$ का मान ज्ञात कीजिए।

$\frac{e^{4x} - 1}{e^{2x}}$ के विस्तार में,$x^2$ का गुणांक क्या है?

$\frac{e^2 + 1}{2e} = $

$\frac{1}{1!} + \frac{1 + 2}{2!} + \frac{1 + 2 + 2^2}{3!} + .....\infty = $

प्रत्येक वास्तविक संख्या $x$ के लिए, मान लीजिए $f(x) = \frac{x}{1!} + \frac{3}{2!} x^2 + \frac{7}{3!} x^3 + \frac{15}{4!} x^4 + \dots$. तो समीकरण $f(x) = 0$ के

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