sec.c File Reference

#include "prim.h"

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Functions
double	sec (double x)
	Secant function. More...

Function Documentation

sec()

double sec

(

double

x

)

Secant function.

sec(x) = 1/cos(x)
       = 1/sqrt(cos(x)*cos(x))

Definition at line 45 of file sec.c.

References cos(), and sqrt().

Referenced by exs(), and RealNumber::Secant().

{
    double a, b, c;

    a = cos(x);
    if (a == 0.0)
    {
        return NAN;
    }

    b = sqrt(a * a);
    c = 1.0 / b;

    return c;
}

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