$\lim_{x\to3}\left(3x^2-5x+4\right)$
$\left(\sin\left(x\right)+\cos\left(y\right)\right)\left(\sin\left(y\right)-\cos\left(x\right)\right)$
$\:\left(x+\:a\right)^2-2\left(x+a\right)+1-\left(x^2-2x+1\right)$
$8n\:=\:-n$
$3x+y=8$
$4x-800$
$\int\tan^{-1}\left(\frac{x}{2}\right)dx$
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