Answer: Show that the formula for the distance d between
Chapter 9, Problem 84(choose chapter or problem)
Show that the formula for the distance d between two points P1 = 1r1 , u12 and P2 = 1r2 , u22 is d = 2r1 2 + r2 2 - 2r1 r2 cos1u2 - u12
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