From Khan Academy and Wikipedia A function is even if f(−x)=f(x) for all values of x.
A function is odd if f(−x)=−f(x) for all values of x.
The graph of an even function is symmetric with respect to the y-axis. The graph of an odd function has rotational symmetry with respect to the origin, meaning that its graph remains unchanged after rotation of 180 degrees about the origin
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