Consider the points A(-3,-3,-1), B(-1,–5,-4), C(-5, -6, -3). - a) Find the unit vector in the direction AB Answer: b) Find a parametric vector equation for the line through A and B. (-) A typical answer should be of the form x = < 1, 2, 3 > + s*< 4, 5, 6 > Answer: Use x to denote the vector c) Find the exact value of cos(BAC). Answer: ands for the parameter. Answer: PO PO d) Find a non-zero normal vector to the plane containing the triangle ABC.

Q: a= b=

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