$x^2-21x$
$\left(4ba^2\:+5xy^3\:\right)^2$
$\int x^3\sin\left(x^3\right)dx$
$\lim_{x\to4}\left(\frac{x^3-48x+128}{x^3-12x^2+48x-64}\right)$
$\frac{a^5b^4c^2}{ab^3c}$
$\int\frac{2x^2}{x^2+a^2}dx$
$\left(11x-29y\right)\left(11x-22y\right)$
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