003 $$
Step 3: Implement the improved Euler's method
The improved Euler's method is given by the following formulas:
$$ k_1 = h * f(x_n, y_n) $$
$$ k_2 = h * f(x_n + h, y_n + k_1) $$
$$ y_{n+1} = y_n + \frac{1}{2} (k_1 + k_2) $$
Step 4: Implement the stopping
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