$\int\frac{1}{\left(1+e^t\right)}dt$
$\frac{-1}{\cos a^2}$
$4\:\cot x+5=9$
$1330-470$
$\frac{1}{3}y\cdot3y$
$\left(n-4^3\right)$
$8x^2-y^2=1$
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