$\left(a^{n+1}+a^{n-1}\right)^2$
$\int x^2\sqrt{3x-2}dx$
$\left(ax^2-by^3\right)^2$
$\frac{x^k}{\left(lnk\right)^k}$
$3x^2-18x+27$
$x^2+6x=40$
$\frac{-x-2}{x+2}$
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