$67-99+66+89-34$
$9:-2$
$5\tan\left(x\right)=-4$
$\int r^2\left(\frac{r^3}{27}+9\right)^8dx$
$3mn^2\left(-5m+4n\right)$
$\sin\left(4x\right)=\sin\left(2x\right)$
$100\left(1-e^{-.2t}\right)$
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