$2.$ Show that the following equalities are incorrect: $($a$)10$n$?+9=$ O$($n$)($b$)$ nalog n $=($n$?)($c$)$ no$/$ log n $=($na$)($d$)$ n$32"+6$n$23"=$ O$($n$32")3.$ Prove or disprove: a$)$ If f$($n$)=$ f$($g$($n$))$ and g$($n$)=$ N$($h$($n$)),$ then h$($n$)=0($f$($n$))$ b$)22$n $=0(2)$ c$)$ slog n$1!=0(1)$ d$)($log nyios log n $=0(($log logn$)$ Vlog$)$