$\frac{3k\left(k+1\right)+6\left(k+1\right)}{2}$
$-\frac{dy}{dx}=\frac{y-3}{y-1}-1$
$\int\frac{3x}{\sqrt[2]{x^2+16}}dx$
$1331\cdot1331$
$121-81b^2$
$\left(3x^25y^2\right)^3$
$23.7-4.13$
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