$4x^2-4x+63$
$\lim_{x\to-\infty}\left(-x^2\cdot e^x\right)$
$\frac{dy}{dx}+cscy=0$
$\frac{4x^3+8x^2+7x+9}{2x+1}$
$5^5.9^5$
$24z^2+72z^2+54z$
$x^4+2x^3-3yx$
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