y1 = Y(X) + h f(X,Y(X)) Y(X+h) = Y(X) + h/2 (f(X,Y(X)) + f(X+h,y1))The step size is
h = (XF - XI)/Nwhere XI is the initial value of X, XF the final value and N the number of steps, as set in the Main Menu.
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