Let

$f(x)=\frac{x^2+4}{4-x^2}$

Find the points of discontinuity of $f.$ For each of them give the number $C$ at which the discontinuity occurs and the values of both one$-$sided limits$.$ Enter INF for $,-$ INF for $-,$ DNE for does not exist, CND for cannot determine. If you find more than one point of discontinuity, enter them in order from smallest to largest. If there are answer boxes left unfilled, fill each of them with an $\text{'}x\text{'}.$

Point $1$: $C=$

$\underset{x{C}^{-}}{lim}f(x)=$

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

$$

$$

Point $2$: $C=$

$\underset{x{C}^{-}}{lim}f(x)=$

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

$$

Point $3$: $C=$

$\underset{x{C}^{-}}{lim}f(x)=$

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