$\left(8x^2+11y^3\right)\left(8x^2-11y^3\right)$
$20\sin\left(\frac{26.4}{5}\pi\right)-3$
$3m^2-5m+4=2$
$\frac{m^6-3^6}{m-3}$
$\lim_{x\to0}\left(\frac{\sqrt{x+1}-1}{x^2}\right)$
$18x^2+72x^2$
$4y+6x-2y$
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