Partial fraction decomposition

${\displaystyle {\frac {f(x)}{g(x)}}}$
${\displaystyle {\frac {f_{1}(x)}{g_{1}(x)}}+{\frac {f_{2}(x)}{g_{2}(x)}}+{\frac {f_{3}(x)}{g_{3}(x)}}+\dots +{\frac {f_{i}(x)}{g_{i}(x)}}}$