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An even function is a function with a graph that is symmetric with respect to the 'y' axis and has the property that f(-x) = f(x)
An odd function is a function with the property that f(-x) = -f(x)
You can also involve trigonometric function to see if they are even or odd.
Tip: This depend on the degrees/radians of the function because it depicts the value of the equation which can change weather or not it is an even or odd function. Also, take in consideration the reference angle/coterminal angle of the negative angle to help you find the right values.