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la place transform of 1. y´´+4y´+6y_=0, y(0)=1, y´(0)=-4 2. y´+y=t^2 , y(0)=0

la place transform of

1. y´´+4y´+6y_=0, y(0)=1, y´(0)=-4

2. y´+y=t^2 , y(0)=0

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