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cosine[x_Complex] := Cos[Re[x]] Cosh[Im[x]] - I Sin[Re[x]] Sinh[Im[x]]£»
Plot3D[Abs[cosine[x + I y]], {x, -3, 3}, {y, -1, 1}]
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(* Rieman surface of Sqrt[z] *)
RevolutionPlot3D[ { Re[Sqrt[r] Exp[I*phi/2]] }, {r, 0,  2}, {phi, -2 \[Pi], 2 \[Pi]}]
RevolutionPlot3D[ { Im[Sqrt[r] Exp[I*phi/2]] }, {r, 0,
  2}, {phi, -2 \[Pi], 6 \[Pi]}]
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