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This is an old revision of this page, as edited by Hayson1991 (talk | contribs) at 02:52, 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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f ( x ) = ∑ n = 0 ∞ ( − 1 ) n x n ( n + 2 ) ! 2 ! n ! {\displaystyle f(x)=\sum _{n=0}^{\infty }(-1)^{n}x^{n}{\frac {(n+2)!}{2!n!}}\,}