Overview
Part 2
Rational functions are functions of the form 
, where n(x) and d(x) are polynomial expressions and 
. Thus, 
and 
are rational functions, while 
and 
are not rational functions, since 
and sin x are not polynomials.
Rational functions are functions of the form , where n(x) and d(x) are polynomial expressions and . Thus, and are rational functions, while and are not rational functions, since and sin x are not polynomials.