$\sqrt{\left(8\right)^2-1}$
$x^2-9=8x$
$\frac{d}{dy}\left(y\cos\left(xy\right)\right)$
$4w^2+36wy+81y^2$
$4.834+0.458$
$\left(x-\:5y\right)^2$
$-.5+7$
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