This is LaTeX code:

[latex]
 
e_1 = \frac{{b_1 }}
{{\left\| {b_1 } \right\|}} = \frac{{x - \frac{1}
{2}}}
{{\sqrt {\frac{1}
{{2\pi }} - \frac{4}
{{\pi ^3 }}} }}
 
[/latex]