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## Sum-to-Product Formulas:Notice-- In formulas 1 and 2, be aware the order of functions in the products:
In formulas 3 and 4, the sum of We hope you can memorize all these formulas effectively, because they are really important. After you think you know all of them then go to Understanding the Formulas section to learn more about them. Or if you need more information about the basic trigonometric formulas, then come here for more information. Good luck. |
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