DLMF:4.23.E3 (Q1755)

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DLMF:4.23.E3
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    Arctan z = 0 z d t 1 + t 2 , multivalued-inverse-tangent 𝑧 superscript subscript 0 𝑧 𝑡 1 superscript 𝑡 2 {\displaystyle{\displaystyle\operatorname{Arctan}z=\int_{0}^{z}\frac{\mathrm{d% }t}{1+t^{2}},}}
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    z ± i 𝑧 plus-or-minus imaginary-unit {\displaystyle{\displaystyle z\neq\pm\mathrm{i}}}
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