$\frac{dy}{dx}=\frac{x+y+1}{x+y-2}$
$\left(x^3+t^5\right)\left(x^3-t^5\right)$
$\left(8z-x\right)^2$
$\left(2x-3\right)^2\left(5x^2+2\right)^3$
$\frac{3x-3}{2}\:\ge-4x\:+\:2$
$\lim_{x\to4}\left(\frac{x^2+4x+4}{x^2-4}\right)$
$-\left(4-x\right)^2$
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