tan

calculate the tangent of an angle

Synopsis:

#include <math.h>
double tan( double x );

Description:

The tan() function computes the tangent of x (measured in radians). A large magnitude argument may yield a result with little or no significance.

Returns:

The tan() function returns the tangent value. When an error has occurred, errno contains a value that indicates the type of error that has been detected.

See also:

atan(), atan2(), cos(), sin()

Examples:

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

void main()
  {
    printf( "%f\n", tan(.5) );
  }

produces the output:

0.546302

Classification:

ANSI

Systems:

Math