sech.c File Reference

Hyperbolic secant function. More...

#include "prim.h"

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Functions
double	sech (double x)
	Hyperbolic secant function. More...

Detailed Description

Hyperbolic secant function.

Definition in file sech.c.

Function Documentation

sech()

double sech

(

double

x

)

Hyperbolic secant function.

sech(x) = 1/cosh(x)

Definition at line 44 of file sech.c.

References cosh().

Referenced by RealNumber::HypSecant().

{
    double a = cosh(x);
    if (TRIG_INEXACT(a))
    {
        return NAN;
    }
    return 1.0 / a;
}

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