Question:medium

Particular solution of $y'' + y = \cos x$ is

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When $f(D) = D^2 + a^2$ and the input is $\cos ax$ or $\sin ax$, always multiply by $x$ and differentiate the denominator.
Updated On: Jul 3, 2026
  • $\frac{x}{2} \sin x$
  • $\frac{1}{2} \sin x$
  • $\sin x$
  • $x \cos x$
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The Correct Option is A

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