cot.c File Reference

Cotangent function. More...

#include "prim.h"

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Functions
double	cot (double x)
	Cotangent function. More...

Detailed Description

Cotangent function.

Definition in file cot.c.

Function Documentation

cot()

double cot

(

double

x

)

Cotangent function.

Parameters

x

cot(x) = 1/tan(x)
       = cos(x)/sin(x)
       = sin(2*x)/(cos(2*x)-1)

Definition at line 47 of file cot.c.

References cos(), and sin().

Referenced by RealNumber::Cotangent().

{
    double a, b, c;

    a = cos(x);
    b = sin(x);

    if (TRIG_INEXACT(b))
    {
        return NAN;
    }

    c = a / b;
    return c;
}

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