This is LaTeX code:
[latex]
T_{P_{AB}P_{BC}P_{AC}}= (\frac{\frac{x_A+x_B+x_B+x_C+x_A+x_C}{2}}{3}, \frac{\frac{y_A+y_B+y_B+y_C+y_A+y_C}{2}}{3})
[/latex]