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**Unformatted text preview: **2 b When calculating trigonometric functions of multiples of 12 π , you have the choice of using an addition formula or using a half-angle formula. b When calculating trigonometric functions of multiples of 8 , you have only one choice: a half-angle formula. It is not possible to write 8 as a sum or difference of our special angles 3 , 6 , and 4 !!! Example 2: Calculate cos 8 . Example 3: Use the half-angle formula to calculate 12 13 sin ....

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