$3$ For L$1$ and L$2$ regular language pairs; L$1$ L$2$ defined by F$.$A$.$ and R$.$E$.$ find it$.$ Show step by step.

$L1=(ab{)}^{*},L2=a(a+b{)}^{*}$

For L$1$ and L$2$ regular language pairs; L$1$ L$2$ defined by F$.$A$.$ and R$.$E$.$ find it$.$ Show step by step.

$L1=(ab{)}^{*},L2=(a+b{)}^{*}aa(a+b{)}^{*}$