$12r^2+36rs+27s^2$
$1=ae^{-x+1}$
$5a^2b\cdot\left(-8b\right)$
$\frac{sec^2\left(x\right)-1}{sin\left(x\right)}$
$131-\left(-121\right)$
$3x\log_{10}\left(2\right)$
$\left(3^5\cdot5^{-4}\right)\cdot\left(2^3\cdot3^{-7}\cdot5^6\right)$
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