I see this all the way to the point where Ca/Oa. I believe that is because OA and Oa are the same length. This is where I am lost is that PO multiplied by a or does he mean the angle POa. Can anyone shed some light on this for me?
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It refers to the angle POa itself. To understand this, use the ratio of opposite/hypotenuse which is Ca/Oa = sin(POa) (standard result).
Thank you. It makes much more sense to me now.
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