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Differential Equations system


How I can solve the following equations system:

{y''[t]=3D=3D-g-a*y'[t]+b*x'[t],
 x''[t]=3D=3D-a*x'[t]
}

or this:
{
  y''[t]=3D=3D-g-(a/y[t])*y'[t],
  x''[t]=3D=3D-a/y[t]*x'[t]
}

Richard


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