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==Theorem==
The [[Weierstrass factorization]] of [[Cosine|$\cos(x)$]] is
$$\cos(x) = \displaystyle\prod_{k=1}^{\infty} \left( 1 - \dfrac{4x^2}{\pi^2 (2k-1)^2} \right).$$

==Proof==

==References==

[[Category:Theorem]]
[[Category:Unproven]]

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