Simple question. So in an example question I'm lookin at finding the work between 2 points on a line. The points are A(1, 0, 0) and B(0, 1, (pi^3)/8) The vector of the line joining these points is then given as: r = i + t(-i + j + [(pi^3)/8]k ) Is that correct? I can't see how that equation arises? It could just be a typo, or I'm just having a stupid day!! Cheers!!