$\frac{2x^2-1}{x^1-2}$
$\left(\frac{1}{3}a-\sqrt{2}b\right)^2$
$\int\frac{\sqrt{a^2-x^2}}{x^4}du$
$\int\frac{x^4-2x^3+x^2+7x-3}{x^2-2x+1}dx$
$\left(7p^2q+3r^3\right)\left(7p^2q-3r^3\right)$
$15\left(\cos^2\left(3\right)+\sin^2\left(3\right)\right)$
$10x^2-25x$
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