$2\pi\:+2\pi\:$
$3\left(x+7\right)-5x$
$8\cdot\left|-4\right|\cdot5$
$20x\left(x-1\right)^6$
$\left(1+cos\left(x\right)\right)\left(tan\left(\frac{x}{2}\right)\right)=sin\left(x\right)$
$\frac{d^2}{dx^2}=2^{xy}$
$6x-4y+6yz-9xz$
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