DLMF:4.23.E25 (Q1777)

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DLMF:4.23.E25
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    arccos x = π i ln ( ( x 2 - 1 ) 1 / 2 - x ) , 𝑥 minus-or-plus 𝜋 𝑖 superscript superscript 𝑥 2 1 1 2 𝑥 {\displaystyle{\displaystyle\operatorname{arccos}x=\pi\mp i\ln\left((x^{2}-1)^% {1/2}-x\right),}}
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