![(D + 2D + 1) y = x {e}^{x} cos x. (D + 2D + 1) y = x {e}^{x} cos x.](https://tex.z-dn.net/?f=%28D+%2B+2D+%2B+1%29+y+%3D+x++%7Be%7D%5E%7Bx%7D+cos+x.)
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answer is in the attachment
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