$\:\:\left(x-y\right)^5$
$15+2x-x^2$
$n-6n+15n^2$
$x+\frac{1}{x}=\sqrt[2]{6}$
$cosx+1=\frac{5}{4}$
$16x^2-8xy+4x^2$
$56.28\cdot3.2$
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