Partial fraction expansion (video) | Khan Academy
https://www.khanacademy.org/math/algebra-home/alg-rational-expr-eq-func/alg-partial-fraction/v/partial-fraction-expansion-2
WEBWhen decomposing into partial fractions, the numerator of each fraction needs to be less than the degree of the denominator. Thus, if the denominator is linear, then the numerator can only be constant. If the denominator is quadratic, then the numerator might be linear, or it might be constant.
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