$4a^4-16b^4$
$21m^2+14m$
$\:\frac{1}{2}m^2-9n^2-m^2-12+n$
$\frac{dw}{dt}=100t\left(w+2\right)$
$x^4+3x^3-107x^2+3x-108$
$\int\frac{4x}{\sqrt{9x^4+25}}dx$
$5+in\left(x+5\right)=7$
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