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

(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;
}

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

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

STANDARDS

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

COMPATIBILITY