SECH

Purpose:

Calculates the hyperbolic secant of any expression.

SECH(val)

val

A scalar, series or table.

A scalar, series, or table.

sech(-5..0.01..5);gridhv;griddot

$image\sechpic01.gif$

displays the hyperbolic secant from –5 to 5.

sech(pi)

returns the result 0.086266738.

sech(-2..0.1..2)

returns a 41 point series.

The hyperbolic secant is defined as:

$image\sech01.gif$

for all complex z.

$image\sech02.gif$

SETDEGREE and SETRADIAN have no effect on this function because it always operates in radians.