$\left(\frac{1}{2}a^2-2b^3\right)^3$
$7\cdot19$
$\left(2a+b\right)\left(2a+c\right)$
$sin^2\left(\frac{\pi\:}{4}\right)-cos^2\left(\frac{\pi\:}{4}\right)\:$
$\left(+2\right)\:x\:\left(+22\right)$
$\left(6xb^4+3b\right)$
$\frac{r^2\:s^4-r^4\:s^2}{r\:s^2-r^2\:s}$
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