$3x\:>\:18\:$
$y'=y\:\tanh x$
$\frac{y^2+1}{y+1}$
$8b-2+3b$
$\left(\frac{2x^2y}{z^{-1}}\right)^{-3}\left(x^{-2}z^4\right)$
$4e^{4x}-4e^{-4x}$
$m^5+m^6-m^8$
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