Show that the distance between 1r1, u12 and 1r2, u22 in
Chapter 8, Problem 72(choose chapter or problem)
Show that the distance between 1r1, u12 and 1r2, u22 in polar coordinates is given by d = 2r1 2 + r2 2 - 2r1r2 cos1u1 - u22.
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