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If a function is symmetrical about Y-axis i.e. for all values of , then the function is called an even function. E.g. Absolute value function.

If a function is symmetrical about origin i.e. ) for all values of , then the function is called an odd function.

If there exists a constant such that is satisfied by all values of , then the function is called a periodic function.

The smallest positive value of satisfying is known as the period of the function

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