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

int main(void){
	double val1;
	double val2;
	double val3;
	double val4;
	double val5;
	double val6;
	val1 = sqrt(fabs(log(0.5)));
	val2 = sin(M_PI/6);
	val3 = atan(pow(13,2));
	val4 = pow(exp(-1),4);
	val5 = log(-3);
	val6 = pow(sqrt(2),2);
	printf("%lf\n", val1);
	printf("%lf\n", val2);
	printf("%lf\n", val3);
	printf("%lf\n", val4);
	printf("%lf\n", val5);
	printf("%lf\n", val6);
	return EXIT_SUCCESS;
}