$\int\frac{3x^2-x+1}{x^4+x^3}dx$
$\frac{2x^2}{x^2+4}$
$m^4-3m^2-10$
$x^3-xy^2=3xy$
$-x^2-4x-5$
$a\left(x^2-y^2+1\right)-x^2+y^2-1$
$\left(3a^3+8b^4\right)^2$
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