$2x^2+4xy-8$
$-2+-5+8+-3+-2u+-8$
$8-2^x=0$
$\int\:e^{tgy}sec^2y\:dy$
$\left(9x^a-8y^{2m}\right)\left(9x^a+8y^2m\right)$
$2mn-4m^2+3n-6m$
$\lim_{z\to-\pi i}\:exp\left(\frac{z^2+\pi^2}{z+\pi i}\right)$
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