csc.c File Reference

Cosecant function. More...

#include "prim.h"

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Functions
double	csc (double x)
	Cosecant function. More...

Detailed Description

Cosecant function.

Definition in file csc.c.

Function Documentation

csc()

double csc

(

double

x

)

Cosecant function.

csc = sin(1/x)
    = -2*sin(x)/(cos(2*x) - 1)

Definition at line 45 of file csc.c.

References cos(), and sin().

Referenced by RealNumber::Cosecant(), and exc().

{
    double a, b, c;

    b = cos(2.0 * x) - 1.0;
    if (b == 0.0)
    {
        return NAN;
    }

    a = -2.0 * sin(x);
    c = a / b;
    return c;
}

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