What does the viewer need to pay special attention to?
The viewer need to pay special attention to this problem. It will require some knowledge of identities. This was covered in previous units and should have been memorized. It is important that they note each step that was taken when simplifying. The way the video is worked out helps to explain the thought process used.
What is the problem about?
The problem deals with half-angles. This was not a hard concept but it did require certain thing from. First of it involved the use of half-angle formulas and identifying which exact formula to use. The problem itself required the use of a Pythagorean identity that made the problem simpler. It is important to simplify correctly as it will make solving easier.
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