यदि $\frac{d^n y}{d x^n}=y_n$ और $y=e^{\sqrt{x}}+e^{-\sqrt{x}}$ है,तो $4 x y_2+2 y_1=$

  • A
    $-y$
  • B
    $y$
  • C
    $2 y$
  • D
    $-2 y$

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