$2x+4<x+18$
$\lim_{x\to1}\left(\frac{x^4-6x^2+8x-3}{x^2+3x+2}\right)$
$3x^2+30x+63$
$28a^3-12a^2+16a^2$
$\int4xe^{2x^2+4}dx$
$\frac{dy}{dx}=ax^2+a^2$
$\int x^3\sqrt{3-x}dx$
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