granice-displaystyle-limntoinfty-fracan2bn4n1-i-displaystyle-limntoinfty-fracn1an2bn4-sa-rowne

$a=0$a=0 i $b=0$b=0

$|a|=1$|a|=1 i $|b|=0$|b|=0

$|a|=1$|a|=1 i $|b|=1$|b|=1

$a=0$a=0 i $|b|=1$|b|=1