1.6 common functions and their graphs
(2) Rational functions
We call the functions like 
(p and q here are polynomials) rational functions. The graphs of these functions are changeable. They depend on what polynomials p and q are. The easiest rational functions are actually, polynomials (here 
). Other easy examples are functions like: 
，
. The graphs of these functions are the pictures below:
This post belongs to Column 「Notes for Calculus Life Saver」 .
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