y''+4y= f(t); y(0)= 1, y''(0)=0 , with   f(t)

2022-04-30

y''+4y= f(t); y(0)= 1, y''(0)=0 , with 

  f(t) = { 0 for 0≤t<4 , 3 for t≥4}

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