Input: dsolve(ds(x,t)=x-2y,ds(y,t)=2x-y)
Write: dsolve(ds(x,t)=x-2y,ds(y,t)=2x-y)
Output: dsolve(dxdt=x−2 y,dydt=2 x−y)==−x2+x y−y2=C1
y⋅d2ydx2-x2-3x-1=0
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