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Please solve this problem for me. Please break it down step by step. DO NOT answer...

Please solve this problem for me. Please break it down step by step. DO NOT answer if your answer is not exact as the one below.

Problem: y^(5th derivative) + 18y^(3rd derivative) + 81y' = x^2 * sin(3x)

The correct answer is [Ax^5 + Bx^3 + Cx^2]cos(3x) + [Dx^5 + Ex^3 + Fx^2]sin(3x).

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answered by: anonymous
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