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ArcCsch
ArcCsch[z] gives the inverse hyperbolic cosecant of the complex number z.
Mathematical function (see Section A.3.10). ArcCsch[z] has a branch cut discontinuity in the complex z plane running from to . See Section 3.2.6. New in Version 1.
Further Examples
ArcCsch[z] gives the inverse hyperbolic cosecant 
of the complex number z. 
to 
. 
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