src/c/elementaryFunctions/Trigonometry/cosd/dcosds.c


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#include <math.h>
#include "cos.h"
#include "cosd.h"

double	       dcosds(double in) 
{
	if(cos((M_PI/180.0)*in)==0.0)
		return 0.0;
	else
	        return (cos((M_PI/180.0)*in));
}