Foxmaths! 2.0

April 11, 2008

Neat Trig Identity

Filed under: Maths — Tags: , , , — Fox @ 10:49 pm

Consider the following,

Cos(\frac{x}{2})Cos(\frac{x}{4})Cos(\frac{x}{8})... = \prod_{i=1}^\infty Cos(\frac{x}{2^i}) = \frac{Sin(x)}{x}

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