< User talk:Hayson1991 This is an old revision of this page, as edited by Hayson1991 talk | contribs ) at 02:41, 15 April 2008. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision .
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{\displaystyle f(x)=\sum _{n=0}^{\infty }(-1)^{n}{\frac {x^{2n}}{(2n)!}}\,}
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