Syntax

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

tan calculates the tangent of x, where x is expressed in radians. If x is too large, a partial loss of significance in the result can occur.

tan returns the value of the tangent of x.

This example computes x as the tangent of pi/4.

#include <math.h>

int main(void)
{
   double pi,x;

   pi = 3.1415926;
   x = tan(pi/4.0);
   printf("tan( %lf ) is %lf\n", pi/4, x);
   return 0;

   /****************************************************************************
      The output should be:

      tan( 0.785398 ) is 1.000000
   ****************************************************************************/
}

• atan - atan2
  
• cos
  
• sin
  
• tanh

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