જો $y=a \cos 3 x+b e^{-x}$ હોય, તો $y^{\prime \prime}(3 \sin 3 x-\cos 3 x)=$

  • A
    $10 y^{\prime} \sin 3 x+3 y(\sin 3 x+3 \cos 3 x)$
  • B
    $10 y^{\prime} \cos 3 x+3 y(\sin 3 x+3 \cos 3 x)$
  • C
    $10 y^{\prime} \cos 3 x+3 y(\cos 3 x+3 \sin 3 x)$
  • D
    $10 y^{\prime} \cos 3 x+3 y(\sin 3 x-3 \cos 3 x)$

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