$\ln\left(m\right)+9\ln\left(v\right)-9\ln\left(m\right)$
$2x-6y+7x+2y$
$6^4\cdot5$
$336-3430$
$\lim_{t\to1}\left(\frac{t^{2}-2t+1}{t^{3}+t^{2}-2}\right)$
$\frac{2x^2-x+1}{x}$
$\sec\left(x\right)=-\frac{13}{5}$
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