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// example 6.17,
// caption: solve by 1)modified euler cauchy, 2)heun method
// h=0.2
// 1) modified euler cauchy method,
// u'=f(t,u)
// u'=-2tu^2
deff('[z]=f(t,u)','z=-2*t*u^2');
modifiedeuler(1,0,.4,.2,f) // calling the function,
// 2) heun method,
deff('[z]=f(t,u)','z=-2*t*u^2');
heun(1,0,.4,.2,f) // calling the function,
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