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Referential transparency
As an example in self-referential paradox, the answer is NO!
to explain to the reader
Trigonometric functions, exponential functions are two common examples.
It means that the value of the function at any point "x" is the same as the value of the function at the negative of "x". The graph of the function is thus symmetrical around the y-axis. Examples of such functions are the absolute value, the cosine function, and the function defined by y = x2.