$\lim_{x\to1}\left(\frac{x^2-x+1}{x^2-1}\right)$
$\left(x^2+3x+1\right)\left(x^2\right)$
$sin\left(2\theta\right)=\frac{\sqrt{3}}{2}$
$\lim_{x\to3}\left(\frac{1}{x-3}\right)$
$2u^2+9u+10$
$\sin\left(3x-\frac{1}{2}\right)$
$\:3m\:+\:6c\:-\:5m\:-\:8c\:+\:10c\:$
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