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FilledSmallSquare Sech[z] gives the hyperbolic secant of z.

FilledSmallSquare Mathematical function (see Section A.3.10).

FilledSmallSquare .

FilledSmallSquare 1/Cosh[z] is automatically converted to Sech[z]. TrigFactorList[expr] does decomposition.

FilledSmallSquare See Section 3.2.6.

FilledSmallSquare See also: ArcSech, TrigToExp, TrigExpand.

FilledSmallSquare New in Version 1; modified in 3.

Further Examples