**6. Simpson's Rule - intmath.com**
https://www.intmath.com/integration/6-simpsons-rule.php

In the last section, Trapezoidal Rule, we used straight lines to model a curve and learned that it was an improvement over using rectangles for finding areas under curves because we had much less "missing" from each segment. We seek an even better approximation for the area under a curve. In Simpson's Rule, we will use parabolas to approximate each part of the curve.

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