- $$\frac{1}{2}\sqrt {{\sigma ^2} \times 4{\tau ^2}} $$
- $$\sqrt {{\sigma ^2} \times 4{\tau ^2}} $$
- $$\frac{1}{2}\left( {\sigma + \sqrt {{\sigma ^2} \times 4{\tau ^2}} } \right)$$
- $$\sigma + \sqrt {{\sigma ^2} \times 4{\tau ^2}} $$
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