$\frac{dx}{dy}=ry\left(1-\frac{y}{k}\right)$
$\frac{36}{3x^2}$
$\int\frac{4x}{\left(x^2+1\right)\left(x^2-1\right)}dx$
$-b\:\:-5ab$
$\frac{8a^9-y^9}{2a^3-y^3}$
$2x^{3\:}+3x^{2\:}-\:18x\:-\:27$
$560+20$
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