Let r be the position vector of a variable point P(x, y, z) in space and let a be a
Chapter 7, Problem 37(choose chapter or problem)
Let r be the position vector of a variable point P(x, y, z) in space and let a be a constant vector. Determine the surface described by (a) (r - a) r = 0 and (b) (r - a) a = 0.
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