$\frac{9yx^2}{3xy}$
$\sqrt{\frac{x^2+5}{x-1}}$
$x^2+6=5x$
$\left(\frac{n\left(n+1\right)}{2}\right)$
$-45x^3+5x$
$\sqrt{2x+2}\sqrt{5}=\sqrt{10}$
$x^5+2x^3$
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