SECH

Purpose:

Calculates the hyperbolic secant of any expression.

Syntax:

SECH(val)

val

-

A scalar, series or table.

Returns:

A scalar, series, or table.

Example:

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

 

 

image\sechpic01.gif

 

displays the hyperbolic secant from 5 to 5.

Example:

sech(pi)

 

returns the result 0.086266738.

Example:

sech(-2..0.1..2)

 

returns a 41 point series.

Remarks:

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.

See Also:

ASEC

ASECH

COSH

GSECH

SEC

TRIGONOMETRIC FUNCTIONS