$y'=\frac{2}{e^{2x}}$
$\frac{x-1}{4}=\frac{x}{5}$
$cos\theta\:\left(csc\theta\:-sec\theta\:\right)+1$
$\lim_{x\to0}\left(1-\sqrt[3]{x}\right)^{\frac{1}{\tan\left(x\right)}}$
$p\left(1+\:r\right)+\:p\left(1+\:r\right)r$
$4x^2+\frac{20}{3}x$
$s^2+18s+81$
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