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    dsolve('D2y=0')

dsolve('Du=1+u^2','t')

y=dsolve('D2y+4*Dy+29*y=0','y(0)=0,Dy(0)=15','x')

%[x,y,z]=dsolve('Dx=2*x-3*y+3*z','Dy=4*x-5*y+3*z','Dz=4*x-4*y+2z','t')