$z\left(x^2y-z^2+xyz\right)$
$2\:2+3\left[\:2-1\right]\:-3\:\:-\:\left[\:3-2\left(-3\right)-1\:\right]+2$
$\frac{-x}{x}$
$\int4cos\left(4x\right)cos\left(9x\right)dx$
$9a^{10}+12a^5+4$
$\left(x^7\right)^{-2}$
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