$2\cos^2x+\cos x=1$
$2x+y-3z=5$
$x\frac{2}{3}y\frac{1}{4}z\frac{2}{5}$
$\frac{dy}{dx}\left(\left(1+x\right)^{\frac{1}{x}}\right)$
$\frac{dy}{dx}=\frac{y}{\left(x-1\right)}$
$\lim_{x\to3}\left(12x\cos x\right)$
$2x^2+13x+6$
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