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

double DEG2RAD(double rad){return M_PI*rad/180.;}

int main()
{
    double i;
    printf("**asin, acos:\n");
    for(i=-1;i<1;i+=0.5){
        printf("%lf %lf %lf\n",i,asin(DEG2RAD(i)),acos(DEG2RAD(i)));
    }
    return 0;
}