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If all x in the f-defined domain has f(-x)=f(x), then f is an even function. This equation is not sufficient for some x values, it must be true for all x in the domain

If all x in the f-defined domain has f(-x)=f(x), then f is an even function. This equation is not sufficient for some x-values, it must be true for all x-rays in the domain.

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