Dave Horner's Website - Yet another perspective on things...
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I have discovered a truly marvelous proof of this, which this margin is too narrow to contain.
--Pierre de Fermat
$$\cos x = \sum\limits_{n = 0}^\infty {\frac{{\left( { - 1} \right)^n x^{2n} }}{{\left( {2n} \right)!}}}$$