$\frac{3-x^2}{4+x^2}$
$20z^2+44z-15$
$\lim_{x\to\infty}\left(\frac{x^32^x}{3^x}\right)$
$csc\left(y\right)\frac{dy}{dx}=-sec^2\left(x\right)$
$2x^3+x^2-4x-3$
$16x^2+24x-9$
$10x+4x+4+8x-2$
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