 \documentclass[12pt,oneside,letter]{memoir}
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 \usepackage{epsfig}
 \usepackage{marvosym}
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 \begin{document}
 
 
$\lambda = d*\sin(\theta)$ 

$\sqrt{\frac{\Sigma_{x}n_{x}(x-\bar{\bar{x}})^{2}}{n - 1}}$

$sd(\bar{x}) = \sqrt{\frac{\Sigma_{G}(\bar{x}-\bar{\bar{x}})^{2}}{N_{G}-1}}$

\Biohazard
 
 \Keyboard
 
\[
A - e*\sin A = \frac{2*\pi*t}{P}
\]

\[
2*\pi*t = P(A - e*\sin A)
\]


 

 
 
 \end{document}
 
 
 
 
 
 
 
 
 
 
 
 
 
 