# Yahoo Messenger Hacks / Development

Monday, 17 July 2006 14:56

YMenuHack
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Reality is merely an illusion, albeit a very persistent one. --Albert Einstein

$$\cos x = \sum\limits_{n = 0}^\infty {\frac{{\left( { - 1} \right)^n x^{2n} }}{{\left( {2n} \right)!}}}$$