$\ln\left(\frac{1}{e^5}\right)$
$-20=-7+w$
$2a+8b-4c$
$\sec^2\left(x\right)=\frac{1}{\cos^2\left(x\right)}$
$\left(2cosx+1\right)\left(tanx+1\right)$
$\lim_{x\to3}\left(\frac{t^2-9}{t^2-5t+6}\right)$
$-\left(-5\right)-\left(-5\right)-\left(-5\right)$
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