DLMF:4.23.E24 (Q1776)

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DLMF:4.23.E24
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    arccos x = i ln ( ( x 2 - 1 ) 1 / 2 + x ) , 𝑥 minus-or-plus 𝑖 superscript superscript 𝑥 2 1 1 2 𝑥 {\displaystyle{\displaystyle\operatorname{arccos}x=\mp i\ln\left((x^{2}-1)^{1/% 2}+x\right),}}
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