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Questions about using complex numbers in Mathematica. This includes basic arithmetic, functions of complex numbers, plotting complex functions, and dealing with branch cuts.
6
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Accepted
Choose a branch cut using assumptions
E^(2 I ϕ)] // Simplify
(* => 0 *)
(You don't have to explicitly state that $\phi\in\mathbb R$, because the fact that it can be compared in an inequality already implies that it's real; the field of complex …