An even function is a type of mathematical function that exhibits symmetry about the y-axis. This means that for any input value $$x$$, the output is the same when the input is the negative of that value; in other words, $$f(-x) = f(x)$$ for all $$x$$ in the domain of the function. The property of being even leads to unique characteristics when graphing, as it results in a mirror image on either side of the y-axis.
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