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asin

 Arc cosine, arc sine, and arc tangent functions

 Declaration:
 Real:                   
              double atan(double x);
              double atan2(double y, double x);


Remarks:

                     atan and atanl calculate the arc tangent of the input value
                    atan2 and atan2l also calculate the arc tangent of the input value

Return Value:

   atan and atanl return the arc tangent of the   input value (in the range -pi/2 to pi/2)
   atan2 and atan2l return the arc tangent of y/x      (in the range -pi to pi).

Program

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

int main(void)
{
   double result;
   double x = 0.5;

   result = atan(x);
   printf("The arc tangent of %lf is %lf\n", x, result);
   return(0);
}

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