aexs.c File Reference

Inverse excosecant function. More...

#include "prim.h"

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Functions
double	aexs (double x)
	Inverse exsecant function. More...

Detailed Description

Inverse excosecant function.

Inverse exsecant function.

Definition in file aexs.c.

Function Documentation

aexs()

double aexs

(

double

x

)

Inverse exsecant function.

Method
    aexsec(x) = arcsec(x+1)
              = arccos(1/(x+1))
              = arctan(sqrt(x^2+2*X))

Definition at line 47 of file aexs.c.

References atan(), and sqrt().

Referenced by RealNumber::ArcExSecant().

{
    double a, b, c;

    if (x > -2.0 && x < 0.0)
        return NAN;

    a = x * x + 2 * x;
    b = sqrt(a);
    c = atan(b);
    return c;
}

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