$\lim_{x\to2}\left(3x^2-2x^2-x+7\right)$
$y+cos^2\left(x\right)=1$
$\left(9s+1\right)+\left(5s+8\right)$
$7mn\left(21x-1\right)$
$\frac{-x^3-4}{x^2}$
$\left(3y-4\right)\left(2y+5\right)$
$4ydx=5xdy$
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