જો $f(x) = f'(x) + f''(x) + f'''(x) + \ldots$ અને $f(0) = 1$ હોય,તો $f(x)$ બરાબર શું થાય?

  • A
    $e^{x / 2}$
  • B
    $e^{x}$
  • C
    $e^{2 x}$
  • D
    $e^{4 x}$

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જો $y=2 \cos (2 \log x)+3 \sin (2 \log x)$ હોય, તો $x^2 y^{\prime \prime}+x y^{\prime}+2 y=$

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