root@ubuntu12:~# cat test.c


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

int main(void) {


        int x=0;

        for (x=0 ; x <= 360; x++) {

                printf("%2.5f\n", cos((double)x));
        }

return(0);
}
emag@ubuntu12:~# gcc -lm -o test test.c
/tmp/ccNA1O2l.o: In function `main':
test.c:(.text+0x1e): undefined reference to `cos'
collect2: ld returned 1 exit status