$8m^2-12$
$\lim_{x\to1}\left(\left\{x+1\right\}\left\{x-1\right\}\right)$
$\lim_{x\to0}\left(\frac{2x}{x+\sin\left(x\right)}\right)$
$-9x^2-8y+5y-2x-9$
$-4b-aby$
$\log\left(x+3\right)=\log7$
$\left(x+\frac{2}{3}\right)^2=-\frac{2}{9}$
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