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Period of a Function

Tool to compute the period of a function. The period of a function is the lowest value t such as f(x+t)=f(x-t)=f(x).

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Period of a Function -

Tag(s) : Mathematics

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Period of a Function

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Tool to compute the period of a function. The period of a function is the lowest value t such as f(x+t)=f(x-t)=f(x).

Answers to Questions

How to find the period of a function?

To find the period t of a function, you must demonstrate that $$ f(x+t)=f(x) $$

\( \sin(x + 2\pi) = \sin(x) \) so \( \sin(x) \) is periodic

The most common periodic functions are trigonometric functions based on sine and cosine functions (that have a 2 pi period), so you can try multiples of pi.

The value of the period found is also called the periodicity of the function.

If the period is equal to 0, then the function is not periodic.

How to prove that a function is not periodic?

If f is periodic, then it exists a real not null such as $$ f(x+t)=f(x) $$ One has to demonstrate that it is impossible. For example with a reductio ad absurdum or performing a calculation that leads to a contradiction.

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