If a graph is axisymmetric with respect to the y-axis, then the graph must be an even function graph, right

Because:
According to the definition of function: in the domain of definition, for any independent variable x, there is a unique and definite value f (x) corresponding to it, then f (x) is the function of X
So: the image about axis symmetry is not even function
For example: a circle centered on the origin o

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