$\sqrt{x^2+ax}-x$
$\left(m-3\right)\left(m+5y\right)$
$x^2-10+8$
$\lim_{x\to0}\left(\frac{x\sec^2x-\tan x}{x^2}\right)$
$2\cdot\cos^2\left(x\right)-\sin^2\left(x\right)=0$
$y=9x^{-4}+4x^{-1}$
$\left(5a+7b-3c\right)\left(b-5c+2a\right)$
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