Question: 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

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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. R

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