$\int\frac{9x-2}{x^2-16}dx$
$\frac{-2x^5+1}{x^4-2x^2+1}$
$12a^2-24a^3+16a$
$y=x-\frac{a}{x}$
$\int\frac{3x^2+2x+3}{x^4+x^3+x^2+x}dx$
$\frac{x^2}{x^2-x-42}-\frac{36}{x^2-x-42}$
$\left(\frac{x^6}{4}-5y\right)^3$
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