$\cos^2x+\cos x-2=0$
$\frac{\left(x+y\right)^2-\left(x+y\right)}{xy}^2$
$\frac{2.8}{0.4}$
$6x^4-5x^3-123x^2-18x+40$
$\int\left(\left(x+5\right)^6\right)dx$
$\frac{d^2}{dx^2}\left(2n^{-1}\right)$
$2\cdot0.1505$
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