$2x^2+6x+4\le0$
$f^2-19f+18$
$\frac{d}{dx}\left(\frac{xe^{3x+2}}{cos\left(2x\right)}\right)$
$20+90+511b$
$4a^2-2a+3-a-a^2+2$
$\int e^{9x+1}dx$
$6x^2+62x+164=4x^2+38x+100$
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