$\frac{x}{x-3}<4$
$\frac{x^3-a^3}{x+a}$
$55m^2n^3x+110m^2n^3x^2-220m^2y^3$
$4b^2-8ab+5a^2-13b^2+16a^2$
$\int\left(x^{12}\left(x^{13}+3x\right)^6\right)dx$
$2\tan x=4-\sec^2x$
$25x^3-75x^4+150^3$
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