This picture is about half angles and the sum and difference formulas. The Unit Circle is essential in solving for the correct answers. It is also shows methods of simplification and in this case, we are using the sum formula.
What should the reader pay attention to?
The reader should pay attention to how similar the answers can be and how it is important to find the half angle to be able to use the correct formula.The viewer should also pay attention to how this is only an example of a sum formula and not a difference formula, meaning that if we were to use a difference formula, signs and variables would be tweaked (changed) just a bit.
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