$\left(m^2-7mn+4n\right)^2$
$r^2-12r+27$
$2\cdot\left(-3\right)\cdot1$
$\frac{du}{dt}=e^{\left(6u+6t\right)}$
$-64+-5-216-15$
$4a^2-9a^2$
$\frac{d^2}{dx^2}\left(-x\cdot y^2\right)$
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