ARC TANGENT (아크탄젠트) > C , C++

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#include <math.h>
#include <stdio.h>
#include<conio.h>
#define PI 3.141592

int main ()
{
  double param, result;

  param = 45;
 
  result = atan (param) * 180 / PI;
 
  printf ("The arc tangent of %lf is %lf degrees\n", param, result );

getch();

return 0;
}




http://www.cplusplus.com/reference/clibrary/cmath/atan/