$\cos255^{\prime}=\frac{\sqrt{2}-\sqrt{6}}{4}$
$10n^2-11n-6$
$n\left(2\cdot18\right)$
$\lim_{x\to\infty}\left(\sqrt{64x^2+x}-8x\right)$
$\left(a-3b\right)x\left(a+x\right)$
$\left(2x+y-1\right)^2$
$\frac{dy}{dx}=\left(\frac{2}{x}-\frac{1}{x^2}\right)^{\frac{1}{2}}$
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