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Exercise 3.7: Reduction of classical fourth order Runge-Kuta formula to Simpsons rule.

When depends only on t, show that the classical fourth order Runge-Kutta formula (35) reduces to Simpson's rule

What is the order of Simpsons's rule; i.e., what is the highest degree polynomial that the rule integrates exactly? To what quadrature rule does the Runge-Kutta method of order 2 correspond when ? When ?