$xy-x-2y+2$
$\frac{x^2-4x-5}{25-x^2}$
$\frac{x}{3x-2}\ge1$
$tan\:\theta\:\:csc\:\theta\:\:cos\theta\:\:=\:1$
$\left(2x+1\right)^2-\left(x-3\right)^2$
$\int\frac{x^2+0.04}{\left(x^2+0.4x+0.04\right)}dx$
$-5\sqrt{6}\cdot\sqrt{8}$
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