$84^2-74^2$
$144-14\cdot3+7-5\cdot6+\left(15-3\cdot3\right)+4^3$
$f\left(x\right)=2x-3x^2$
$\:\frac{x^3-8x+5}{x+3}$
$1-\cos^2\left(\frac{x}{2}\right)$
$\left(x\:+\:y\:-\:x\right)\left(x\:-\:y\:+\:x\right)$
$\frac{6a^3m^2-3a^2m^2+4a^3n-2a^2n}{5}$
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