Well, let's actually work it out. So what is the antiderivative of e to the 1.2t? Well, let me just try to do it over here. So if I am trying to calculate, let me write it as e to the five, or actually 6 5ths t, 12 tenths is the same thing as 6 5ths, 6 5ths t dt. So this is an indefinite integral. I'm just trying to figure out the antiderivative here. Well, if I had a 6 5ths right over here, then u substitution, or sometimes you would say the inverse chain rule, would be very appropriate.