Atan / Atanl :

1. The atan() function returns the arc Tangent of an argument
2. Atan return the arc tangent of the input value [ in the range -PI/2 to PI/2 ]
3. Header File : Math.h

Syntax :

double atan( double arg );
long double atanl(long double (x));

Live Example :

#include<stdio.h>
#include<math.h>
#define PI 3.14159265
int main ()
{
  double para, result;
  param = 1.0;
  result = atan (para) * 180 / PI;
  printf ("The arc tangent of %lf is %lf degrees\n", para,result );
  return 0;
}

Output :

The arc tangent of 1.000000 is 45.000000 degrees.

---

Tags / Keywords : | Acos, Acosl, asin, asinl, atan, atanl, cos, math.h, sin, tan

---