#include <stdio.h>
#include <math.h>
int main() {
printf("%f\n", asin(0.64));
printf("%f\n", asin(-0.4));
printf("%f\n", asin(0.0));
printf("%f\n", asin(1.0));
printf("%f\n", asin(-1.0));
printf("%f\n", asin(2.0));
return 0;
}