DLMF:4.23.E33 (Q1785)

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DLMF:4.23.E33
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    w = Arctan z = arctan z + k π , 𝑤 multivalued-inverse-tangent 𝑧 𝑧 𝑘 𝜋 {\displaystyle{\displaystyle w=\operatorname{Arctan}z=\operatorname{arctan}z+k% \pi,}}
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    z ± i 𝑧 plus-or-minus imaginary-unit {\displaystyle{\displaystyle z\neq\pm\mathrm{i}}}
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