$\left(xy-mn\right)\left(xy+mn\right)$
$-1+2-2+1-3$
$-z\left(5-7z\right)$
$3.09\left(j+4.6\right)$
$\frac{d}{dx}x^2a^{6x+4}$
$\sqrt[2]{-25}$
$\int_{\sqrt{2}}^{2}\frac{1}{t^{3}\sqrt{t^{2}-1}}dt$
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