>>> seuil()
Traceback (most recent call last):
  File "<pyshell#64>", line 1, in <module>
    seuil()
  File "/home/clerc/Documents/maths/spe1ere/E3C/E3C_51.py", line 7, in seuil
    puissance=120*exp(-0,14*t)
TypeError: exp() takes exactly one argument (2 given)