Difference between revisions of "Weierstrass factorization of cosine"
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Revision as of 05:01, 20 March 2015
Proposition: $\cos(x) = \displaystyle\prod_{k=1}^{\infty} \left( 1 - \dfrac{4x^2}{\pi^2 (2k-1)^2} \right)$
Proof: █
