$x^2y^2+25x+42x$
$1^2-4x-21$
$\int sdx$
$\frac{sin^2xcosx+cos^3x}{cosx}$
$\lim_{x\to0}\left(\frac{\sqrt{x^2+4}-2}{2x^2-x}\right)$
$\log\left(-4-x\right)+\log\left(3\right)=\log\left(2-x\right)$
$\left(-5x^2-9y^3\right)^2$
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