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tangent function

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NAME

tan

INTERFACE

#include <math.h>

double tan ( double x ) long tanl ( long double x ) float tanf ( float x )

#include <complex.h> complex tan(complex x) double complex ctan(double complex x) float complex ctan(float complex x) long double complex ctanl(long double complex x)

DESCRIPTION

The tan function computes the tangent of x (measured in radians), this is identical to the calculation of

$\tan(x) = \frac{sin(x)}{cos(x)}$

(1)

Example 1

#include <stdio.h>
#include <math.h>

int main()
{
  double x=0.5;
  double result = tan(x);
  printf("The tangent of %lf is %lf\n", x, result);
}

SPECIAL VALUES

tan ( ±0 ) returns ±0.
tan ( ±infinity ) returns a NaN and raises the invalid floating-point exception.

STANDARDS

The tan function conforms to ISO/IEC 9899:1999(E).

COMPATIBILITY

<table class="compat"> <tr><th></th><th>DOS</th><th>UNIX</th><th>Windows</th><th>ANSI C</th><th>C++ only</th></tr> <tr><td>tanl</td><td>•</td><td></td><td>•</td><td></td><td></td></tr> <tr><td>Real tan</td><td>•</td><td>•</td><td>•</td><td>•</td><td></td></tr> <tr><td>Complex tan</td><td>•</td><td></td><td>•</td><td></td><td>•</td></tr> <tr><td>Complex ctan</td><td></td><td>•</td><td></td><td></td><td>•</td></tr> </table>

tan