- $$\frac{1}{2}\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
- $$\sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
- $$\frac{1}{2}\left( {{\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} } \right)$$
- $${\text{M}} + \sqrt {{{\text{M}}^2} + {{\text{T}}^2}} $$
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