I WILL GIVE DISLIKES $!!!$ IF ANYTHING WRONG HAPPENS IN MY QUESTION, BETTER SKIP IT$!!!$

$$

x$[$n$]=1+$cos$(2$n$/6)$

y$[$n$]=$XB$06$ sin$(4$n$/6)$

z$[$n$]=$x$[$n$]$y$[$n$]$

$$ x$[$n$]$ DTFS $?$

$$y$[$n$]$ DTFS $?$

$$ z$[$n$]"$