Consider the vector U = (6, -3, 7). (a) What is the unit vector u in the same direction as U ? u = FORMATTING: Your answer should be a vector in the form (a, b, c) and each entry must be exact, not a decimal approximation. In Mob sqrt(a). (b) Give a unit vector w that is orthogonal to v. w = FORMATTING: You must use the notation of the scientific calculator. In particular, all multiplications must be written with a *. For instance 3*sqrt