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// example no. 6.20,
// caption: solve the system of equations
//1) eulercauchy method solving simultanious ODE
deff('[z]=f1(t,u,v)','z=-3*u+2*v');
deff('[w]=f2(t,u,v)','w=3*u-4*v');
[u,v,t] = simeulercauchy(0,.5,0,.4,.2,f1,f2)
// 2) RK4 method solving simultanious ODE
[u,v,t]=simRK4(0,.5,0,.4,.2,f1,f2)
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