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 to the top of the second polle. Show that the shortest length of rope occurs when [tex]\theta_1=\theta_2[/tex](adsbygoogle = window.adsbygoogle || []).push({});

I have found eqn and found the derivative, what do I do to show that it is a min?

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# Optimization homework problem help

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