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Chapter 4, Problem 78(choose chapter or problem)
Two vertical poles 𝑃𝑄 and 𝑆𝑇 are secured by a rope 𝑃𝑅𝑆 going from the top of the first pole to a point 𝑅 on the ground between the poles and then to the top of the second pole as in the figure. Show that the shortest length of such a rope occurs when 𝛳1＝ 𝛳2.
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