$y-y$
$n^2+2n-3$
$250x^2-40$
$\left(3x+y-2z\right)^2$
$\int\frac{x}{\sqrt{x^2-1}\cdot x^2}dx$
$3y^2dx=6x^4dy$
$\sqrt{16}-104x^2+169x^4$
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