ArcSec[Sec[z]] == Piecewise[ {{(-1)^Floor[Re[z]/Pi] (-z + Pi Floor[Re[z]/Pi] - Pi/2) + Pi/2, Element[Re[z]/Pi, Integers] && Im[z] <= 0}, {(-1)^Floor[Re[z]/Pi] (z - Pi Floor[Re[z]/Pi] - Pi/2) + Pi/2, True}}]

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2007-05-02