DLMF:4.22.E2 (Q1749)

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DLMF:4.22.E2
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    test
    cos ⁡ z = ∏ n = 1 ∞ ( 1 - 4 ⁢ z 2 ( 2 ⁢ n - 1 ) 2 ⁢ π 2 ) . 𝑧 superscript subscript product 𝑛 1 1 4 superscript 𝑧 2 superscript 2 𝑛 1 2 superscript 𝜋 2 {\displaystyle{\displaystyle\cos z=\prod_{n=1}^{\infty}\left(1-\frac{4z^{2}}{(% 2n-1)^{2}\pi^{2}}\right).}}
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    DLMF id
    DLMF:4.22.E2
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