$($a$)\underset{x-}{lim}f(x)$

$($b$)\underset{x-1^{-}}{lim}f(x)$

$($c$)\underset{x-1^{+}}{lim}f(x)$

$($d$)\underset{x-1}{lim}f(x)$

$($e$)\underset{x{0}^{-}}{lim}f(x)$

$($f$)\underset{x{0}^{+}}{lim}f(x)$

$($g$)\underset{z0}{lim}f(x)$

$($h$)\underset{x{1}^{-}}{lim}f(x)$

$($i$)\underset{z{1}^{+}}{lim}f(x)$

$($j$)\underset{y1}{lim}f(x)$

$($k$)\underset{x}{lim}f(x)$