$\left(3\sqrt{3x}+2\sqrt{5y}\right)\left(3\sqrt{3x}-2\sqrt{5y}\right)$
$\frac{1}{2}x+17=13$
$-4\left(7n-6\right)+4n$
$\int\frac{sec^2\left(2x\right)}{1+3tan^2\left(2x\right)}dx$
$\left(x^2y-3y\right)\frac{dy}{dx}=xy^3$
$\left(4\right)^3-2\left(4\right)^2+\left(4\right)-9$
$\left(1+r\right)^3$
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