# What are odd and even functions?

There are two main types of functions:

• odd functions: if the input of these functions is negative, the result will be negative; if the input is positive (with the same absolute value of the negative input) the output will be positive:
$f(-x)=-f(x)$

Examples of odd functions are sin(x), x³, -x, x etc… .

• even functions: regardless of the sign of the input, the result will always be positive:
$f(-&space;x)=f(x)$

Examples are , |x|, 1-, cos(x) etc… .

And this is what you need to know about odd and even functions! If you have any questions, leave a comment and I will be happy to reply!

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