http://demonstrations.wolfram.com/PartialFractionDecomposition/
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Many rational functions can be expressed as a sum of simpler fractions. For example, x + 1/(x - 3)(x - 1) can be expressed as the sum A/x - 3 + B/x - 1. To find A and B, Heaviside's method can be used. First, multiply the original fraction by (x - 1), c...
Contributed by: Ed Pegg Jr
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