Laplace Transform

liz1217

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Joined
May 3, 2016
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1
Hi guys,

I need help to find the Laplace transform of the following initial value problem.

y" + 3y' + 7y = cos t

y(0) = 0
y'(0) = 2

I found the following answer: Y(s) = 2S^3 - S/ (S^2+1)(S^2+3S+7).

However, the book shows the following answer: Y(s) = 2S^2+S+2/(S^2+1)(S^2+3S+7).

Can anyone help me?
 
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