જો $y^{1/4} + y^{-1/4} = 2x$,અને $(x^2 - 1) \frac{d^2y}{dx^2} + \alpha x \frac{dy}{dx} + \beta y = 0$ હોય,તો $|\alpha - \beta|$ ની કિંમત ...... છે.

  • A
    $17$
  • B
    $18$
  • C
    $19$
  • D
    $20$

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