$2cos^2\left(\theta\:\right)-4sin^2\left(\theta\:\right)$
$\frac{x}{9}-y=\frac{8}{9}$
$2^{-n\left(x-1\right)}$
$\lim_{x\to0}\left(\frac{x\ln\left(x+1\right)}{x^2+1}\right)$
$\frac{dy}{dx}-3y=e^x$
$0.09p^2-0.64$
$\lim\:_{h\to\:\:-2}\left(\frac{h^2-2h-8t}{h^2-4}\right)$
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