\[\frac{\frac{\beta - \alpha}{\left(\alpha + \beta\right) + 2.0} + 1.0}{2.0}\]

\(\begin{cases} \frac{1}{2.0 + \left(\beta + \alpha\right)} \cdot \frac{\beta}{2.0} - \frac{\frac{\left(\frac{\frac{24.0}{\alpha}}{\alpha} - \frac{\frac{80.0}{\alpha}}{{\alpha}^2}\right) - \frac{6.0}{\alpha}}{\frac{2.0 \cdot \left(2.0 + \left(\beta + \alpha\right)\right)}{2.0 + \left(\beta + \alpha\right)}}}{\frac{\alpha}{2.0 + \left(\beta + \alpha\right)} \cdot \frac{\alpha}{2.0 + \left(\beta + \alpha\right)} + \left(\frac{1.0 \cdot \alpha}{2.0 + \left(\beta + \alpha\right)} + 1.0 \cdot 1.0\right)} & \text{when } \frac{\beta - \alpha}{\left(\alpha + \beta\right) + 2.0} \le -0.99999994f0 \\ \frac{\frac{\beta - \alpha}{{\left(\left(\alpha + \beta\right) + 2.0\right)}^{1}} + 1.0}{2.0} & \text{otherwise} \end{cases}\)