#### Answer

$ R $

#### Work Step by Step

The domain of any function consists of the values it can take on the x-axis.
Note that we can not have zero in the denominator. However, $ x^2+4\neq 0$, so the domain of $ f $ is the whole real line $ R $.

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Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

$ R $

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