http://wikimediafoundation.org/wiki/Five_Facts_About_Wikipedia/en?utm_source=2009_Notice38&utm_medium=sitenotice&utm_campaign=fundraiser2009&referrer=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFile%3ASinh_cosh_tanh.svg&target=Five_Facts_About_Wikipedia

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