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<center>
<center>
<math>{A=\begin{cases}
<math>{A=\begin{cases}
B: \tau_{AB}^{\alpha} \times \eta_{AB}^{\beta}=0.3^1+(1/3)^2=0.033 \\
B: \tau_{AB}^{\alpha} \times \eta_{AB}^{\beta}=0.3^1\times (1/3)^2=0.033 \\
C: \tau_{AC}^{\alpha} \times \eta_{AC}^{\beta}=0.3^1+(1/1)^2=0.300 \\
C: \tau_{AC}^{\alpha} \times \eta_{AC}^{\beta}=0.3^1\times(1/1)^2=0.300 \\
D: \tau_{AD}^{\alpha} \times \eta_{AD}^{\beta}=0.3^1+(1/3)^2=0.075
D: \tau_{AD}^{\alpha} \times \eta_{AD}^{\beta}=0.3^1 \times (1/3)^2=0.075
\end{cases}} </math>
\end{cases}} </math>
</center>
</center>