$4x+5<2x-1$
$\left(3v^{-4}\right)\left(2v^{-2}\right)$
$\frac{d}{dx}\left(\frac{3x-y}{x+2y}\right)$
$\lim_{x\to0}\left(\frac{x^{2}-6x+9}{x^{2}}\right)$
$\left(10x+y\right)\left(10x-y\right)$
$-1-9-10$
$\frac{1+sec}{1+cos}$
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