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Computing › C › Math.h ›

tan

Tangent function
Contents
  1. Interface
  2. Description
  3. Special Values
  4. See Also
  5. Standards
  6. Compatibility
  7. 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.

See Also

reference:acos, reference:asin, reference:atan, reference:atan2, reference:cos, reference:cosh, reference:sin, reference:sinh, reference:tanh

Standards

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

Compatibility

DOSUNIXWindowsANSI CC++ only
tanl••
Real tan••••
Complex tan•••
Complex ctan••
Last Modified: 18 Dec 11 @ 13:09     Page Rendered: 2021-12-20 18:40:50