Heun (forbedret Euler, RK2)
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yn+1=yn+(h/2)(k1+k2)y_{n+1} = y_n + (h/2)(k_1 + k_2)yn+1=yn+(h/2)(k1+k2) med k2=f(t+h,y+hk1)k_2 = f(t+h, y+hk_1)k2=f(t+h,y+hk1).
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