For each function, find the value$(s)$ where the function $is$ not defined. Then, find the domain $of$ the function.

$(a)f(x)=\frac{16-e^{x^2}}{1-e^{16-x^2}}$

Find the values $ofx$ for which $f(x)is$ not defined. $(Enter$ your answers $as$ a comma$-$separated list. $Ifan$ answer does not exist,

enter DNE.$)$

$x=$

Find the domain $of$ the function. $(Enter$ your answer using interval notation.$)$

$(b)f(x)=\frac{7+x}{e^{cos(x)}}$

Find the values $ofx$ for which $f(x)is$ not defined. $(Enter$ your answers $as$ a comma$-$separated list. $Ifan$ answer does not exist,

enter DNE.$)$

$x=$

Find the domain $of$ the function. $(Enter$ your answer using interval notation.$)$