Function defined by a relation of the form \(f\left(x\right)=\dfrac {p\left(x\right)}{q\left(x\right)}\) where *p*(*x*) and *q*(*x*) are polynomials and at least one of the coefficients of *q*(*x*) is non-zero.

### Example

The function *f* defined for all real numbers by the relation \(f\left(x\right)=\dfrac {4x-2}{x+1}\) is a rational function.

The graph of the function has two asymptotes :