$\cos\left(a\right)^3+\sec\left(a\right)^2\cdot\cos\left(a\right)$
$5a-2b-3a+7b$
$8x^6+729$
$\left(a-2b+4\right)\cdot\left(-5c\right)$
$\frac{1}{\left(-x^{2\:}-x\:+72\right)}$
$\sqrt{45m^6n^8}$
$2a-2b+2c$
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