જો $y=3 \cos (\log x)+4 \sin (\log x)$ હોય,તો $x^2 y_2+x y_1=$

  • A
    xy
  • B
    $-x y$
  • C
    $-y$
  • D
    y

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જો $y = a \sin x + (5 + 2x) \cos x$ હોય,તો $y'' + y =$

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