$\left(7j+4w-5y\right)^2$
$-\left|8\right|\le\left|-8\right|$
$\left(5x^2-2x^2-3\right)$
$\frac{x^4}{\left(1-x^4\right)}$
$a^2-9a+21$
$\frac{d}{dz}\left(e^x\cdot\sin\left(y+z\right)\right)$
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