$\frac{t^{3}+1}{t+1}$
$\frac{dy}{dx}=\frac{x+y}{x+y-2}$
$\frac{1}{2}\ln\left(\frac{1+x}{1-x}\right)$
$\frac{x}{x+5}-\frac{5}{x-5}$
$f^2+3f+1$
$\left(225xy+34xy\right)^2$
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