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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 this problem if its not exact as below.

Find the Laplace transform Y(s) of the solution to the following initial-value problem. Do not attempt to recover y(t) from each Y(s) you obtain.

y'' - 4y = t^3 with y(0) = 1 and y'(0) = 3

The correct answer is Y(s) = s+3 / s^2-4 + 6 / s^4(s^2-4)

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