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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

(1)

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

Example 1:

#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;
}

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		•			•

Last Modified: 2009-11-01 08:42:34 Page Rendered: 2010-03-14 12:36:11

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tan