Ryan Y. answered • 07/31/18

Tutor

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Univ. level Calculus lecturer. Experienced former AP Calc/Phys inst.

Hi Erika,

First you will need to graph

r= 4 cos θ. This can be done by graphing y = 4 cosθ and then "wrapping the graph about the origin". This method takes some practice but helps make the problem more transparent. However you can also use a graphing calculator. The graph for r= 2 should be easy by comparison. Then you should shade in the are you are trying to find. This will allow you to find the upper and load limit more easily.