$3^x$ के विस्तार में $x^3$ का गुणांक क्या है?

  • A
    $\frac{3^3}{6}$
  • B
    $\frac{(\log 3)^3}{3}$
  • C
    $\frac{\log(3^3)}{6}$
  • D
    $\frac{(\log 3)^3}{6}$

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श्रेणी $\frac{1}{2!} + \frac{1}{4!} + \frac{1}{6!} + \dots \infty$ का योग ज्ञात कीजिए।

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$\frac{e^{7x} + e^x}{e^{3x}}$ के विस्तार में $x^n$ का गुणांक क्या है?

$3 + \frac{5}{1!} + \frac{7}{2!} + \frac{9}{3!} + \dots \infty = $

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

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

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