यदि $y = a \cos(\log x) + b \sin(\log x)$ जहाँ $a, b$ प्राचल (parameters) हैं,तो ${x^2}y'' + xy' = $

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

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