$27+9a$
$\frac{dt}{dp}=rp\left(1-\frac{p}{k}\right)$
$\left(3z-\frac{1}{2}y^3\right)^2$
$7\cdot50m$
$4a^3+bx-4bx$
$\int\frac{\sqrt{4x^2+9}}{x^3}dx$
$\left(3p\:+\:4q\right)^2$
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