Homework Statement
The position of a spaceship is (3 + t, 2 + ln(t), 7 - \frac{4}{t^2 + 1}) and the coordinates of the space station are (6, 4, 9). The captain wants the spaceship to coast into the space station. When should the engines be turned off?
Homework Equations
r' = (1, \frac{1}{t}...