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{{ printedBook.courseTrack.name }} {{ printedBook.name }} An even function is a function for which $f(\text{-} x) = f(x)$ for all $x$ in its domain. The graph of an even function has even symmetry, which means that it is symmetric about the $y\text{-}$axis. The functions $y=x^2$ and $y=|x|$ are two examples of even functions.

There are infinitely many even functions and the shapes of their graphs display a large variety.

A function that is not even, is either an odd function or neither even nor odd.