At about the 50 second mark, he states and labels the top of the unit circle as pi over 4, when it should actually be pi over 2. He also labels the point on the left as 4/4 when it should have been 4 pi over 4. At about the 2 minute mark, he says "6 over 6 pi" when he should have said "6 pi over 6".
How to find the point on the unit circle from the given real number
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