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#include <stdio.h>
#include <math.h>
 
int main() {
	double x;
	double y;
	double z1;
	double z2;
 
	scanf("%lf",&x);
	scanf("%lf",&y);
	z1=pow( cos(x),4)+pow(sin(y),2)+1.0/4*pow(sin(2x),2)-1
	z2=sin(x+y)*sin(y-x)
	printf("z1=%lf",z1);
	printf("z2=%lf",z2);
	return 0;
}

prog.c: In function ‘main’:
prog.c:12:48: error: invalid suffix "x" on integer constant
  z1=pow( cos(x),4)+pow(sin(y),2)+1.0/4*pow(sin(2x),2)-1
                                                ^~
prog.c:12:56: error: expected ‘;’ before ‘z2’
  z1=pow( cos(x),4)+pow(sin(y),2)+1.0/4*pow(sin(2x),2)-1
                                                        ^
                                                        ;
  z2=sin(x+y)*sin(y-x)
  ~~                                                     
prog.c:7:9: warning: variable ‘z1’ set but not used [-Wunused-but-set-variable]
  double z1;
         ^~
prog.c:10:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lf",&x);
  ^~~~~~~~~~~~~~~
prog.c:11:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lf",&y);
  ^~~~~~~~~~~~~~~

Standard output is empty