DLMF:4.31.E3 (Q1853)

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DLMF:4.31.E3
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    lim z 0 cosh z - 1 z 2 = 1 2 . subscript 𝑧 0 𝑧 1 superscript 𝑧 2 1 2 {\displaystyle{\displaystyle\lim_{z\to 0}\frac{\cosh z-1}{z^{2}}=\frac{1}{2}.}}
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