$\lim_{x\to1}\left(\frac{\ln\left(3x^3-1\right)}{cosx-1}\right)$
$-2r\:-\:r+8$
$\int\frac{\sqrt{1+x}^2}{x}dx$
$\frac{dy}{dx}=\frac{6y^2-xy-6x^2}{5xy}$
$tan\left(30\right)^2+1=\frac{1}{\cos\left(30\right)^2}$
$-10xy+5y=-5y$
$dy=5xydx$
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