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okkvlt
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this is really perplexing. how can it be exact? simpsons rule uses quadratics to approximate the curve. how can it be exact if I am approximating a cubic with a quadratic?
Simpson's rule is exact for 3rd degree polynomials because it is based on the fundamental theorem of calculus, which states that the definite integral of a function can be calculated by finding the anti-derivative of that function. Since 3rd degree polynomials can be integrated exactly, Simpson's rule is able to accurately calculate the area under the curve.
Simpson's rule differs from other numerical integration methods because it uses a parabolic approximation of the curve, rather than straight line segments or trapezoids. This makes it more accurate for curved functions, particularly 3rd degree polynomials.
Simpson's rule divides the area under the curve into multiple small parabolic segments and calculates the area of each segment. These areas are then added together to give an approximation of the total area under the curve.
Yes, Simpson's rule is always exact for 3rd degree polynomials. However, it may not be exact for higher degree polynomials or other types of functions.
Simpson's rule can be used for any function that is continuous and has a known anti-derivative. However, it may not always give an accurate result for functions with large variations or sharp turns.