$16n^6+40n^3+25$
$2b^4+3a^2-4a+5b;\:a=7\:b=6$
$2x^2-12x-3$
$-x\cdot\:\:2\cdot\:\frac{dy}{dx}=xy$
$\frac{du}{dx}+u=e^x$
$4-20x+5$
$\frac{3\:x\:3\:+3\:x\:2\:-8\:x-1\:0}{x+1}$
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