## Atan / Atanl Function >> Math.h >> Header File in C

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 ]

Syntax :

```double atan( double arg );long double atanl(long double (x));
Live Example :
#include<stdio.h>#include<math.h>#define PI 3.14159265int main (){  double para, result;  param = 1.0;  result = atan (para) * 180 / PI;  printf ("The arc tangent of %lf is %lf degreesn", para,result );  return 0;}
Output :
The arc tangent of 1.000000 is 45.000000 degrees.

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