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$\sec^2x\cdot\tan ydx+\sec^2x\cdot\tan xdy$
$\left(4xy\right)^{-1}$
$\frac{d}{dx}\left(\ln\right)\left(ax+b\right)^2$
$\left(2a+3b\right)\left(2a-3b\right)\left(2x-6\right)^2$
$2z^2-7z-4=0$
$15a^2b+20ab^2-5a^3b^4$
$25m^2+10m+1$
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