y'''+y''+y=Sin[x];
y''+y'+y=ArcSin[x];
y''+y+y^2=0;
y''=y,y[0]==0,y'[0]=4;
y+x*y'=x,y[6]=2;
y'''[x]+2y''[x]-3y'[x]+y=x,y[0]=1,y[1]=2,y'[1]=2;
{x'+y'=2,x'-2y'=4}.
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