$\left(6x+3y\right)^5$
$\left(m^2-m+n\right)^2$
$9k^4\:+\:36k^2\:+\:36$
$4\sin^2x+2=4$
$-114-78$
$\frac{x^2-y^2}{y-x}$
$2x+\frac{y}{3}$
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