$y = a \cos x + (b + 2x) \sin x \Rightarrow y^{\prime \prime} + y = $

  • A
    $\cos x$
  • B
    $2 \cos x$
  • C
    $3 \cos x$
  • D
    $4 \cos x$

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$\frac{d^2}{dx^2}(2\cos x \cos 3x) = $

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