find the domain of each function enter your answer using interval nota
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Find the domain of each function. (Enter your answer using interval notation.) \text { (a) } f(x)=\frac{25-e^{x^{2}}}{1-e^{25-x^{2}}} \text { (b) } \quad f(x)=\frac{9+x}{e^{\cos (x)}}