− t 3 + 3 t 2 − 3 t + 3 − 3 t + 3 t 2 − 1 t 3 {\displaystyle -t^{3}+3t^{2}-3t+3-{\frac {3}{t}}+{\frac {3}{t^{2}}}-{\frac {1}{t^{3}}}}
