$\left(\frac{2}{3}x+\frac{3}{2}y\right)^2$
$3r^2-\:81$
$\left(2\cdot\left(-3\right)\cdot\left(-1\right)\right)^3$
$\left(x^2-3y^2\right)\left(x^2+3y^2\right)$
$\lim_{x\to0}\left(\frac{16-x^2}{\sin\left(\pi x\right)}\right)$
$3.75-5.47$
$43\cdot74$
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