ArcSec
 Usage
• ArcSec[z] gives the arc secant  of the complex number z.
Notes
• Mathematical function (see Section A.3.10). • All results are given in radians. • For real z outside the interval  to  , the results are always in the range  to  , excluding  . • ArcSec[z] has a branch cut discontinuity in the complex z plane running from  to  . • New in Version 1.
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