Dave Horner's Website - Yet another perspective on things...
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Premature optimization is the root of all evil (or at least most of it) in programming. -- Donald Knuth
$$\cos x = \sum\limits_{n = 0}^\infty {\frac{{\left( { - 1} \right)^n x^{2n} }}{{\left( {2n} \right)!}}}$$