$\frac{\left(e^x-2\right)e^x}{e^x+1}$
$\int\frac{1}{x^2-4x-5}dx$
$t^2-21t+1$
$1+sec^2x=\left[\frac{1}{tan^2x}\right]$
$a^2-12a+36$
$2r+3s-5r$
$\int_{x\left(x^2+1\right)}^1dx$
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