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* If an even function is integrable over a bounded symmetric interval <math>[-A,A]</math>, the integral over that interval is twice the integral from 0 to ''A''; that is<ref>{{cite web|url=http://mathworld.wolfram.com/EvenFunction.html|title=Even Function|first=Weisstein, Eric|last=W.|website=mathworld.wolfram.com}}</ref>
*:<math>\int_{-A}^{A} f(x)\,dx = 2\int_{0}^{A} f(x)\,dx</math>.
** This property is also true for the [[improper integral]] when <math>A = \infty</math>, provided the
===Series===
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