tan

Tangent function

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Contents

Interface
Description
Special Values
See Also
Standards
Compatibility
Page Comments

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:

Example - Tangent function

Workings

#include <stdio.h>
#include <math.h>
int main()
{
  double x = 0.3333;
  double result = tan(x);
  printf("The tangent of %.4lf is %.4lf\n", x, result);
  return 0;
}

Solution

Output:

The tangent of 0.3333 is 0.3462

Special Values

tan ( ±0 ) returns ±0.

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

Standards

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

Compatibility

	DOS	UNIX	Windows	ANSI C	C++ only
tanl	•		•
Real tan	•	•	•	•
Complex tan	•		•		•
Complex ctan		•			•

Page Comments

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

complex	`tan` (complex x)
double complex	`ctan` (double complex x)
float complex	`ctan` (float complex x)
long double complex	`ctanl` (long double complex x)