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Sec
 Sec[z] gives the secant of z.
Mathematical function (see Section A.3.10).
The argument of Sec is assumed to be in radians. (Multiply by Degree to convert from degrees.)
 .
1/Cos[z] is automatically converted to Sec[z]. TrigFactorList[expr] does decomposition.
See The Mathematica Book: Section 3.2.6.
See also: ArcSec, TrigToExp, TrigExpand.
Further Examples
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