$\int sech\left(40x\right)tanh\left(40x\right)dx$
$-\left(a+b\right)+\left[-3a+b-\left\{-2a+b-\left(a-b\right)\right\}+2a\right]$
$\log_{12}\:n=1$
$\lim_{x\to0}\left(e^{-3x}\right)$
$6m^3n^2,\:9m^2n^3,\:18m^4n^5$
$\left(7+17^1\right)$
$20x^3y^4-30x^3z^3$
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