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IntroductionEssenceMemorizingUnderstandingSummarizingPage 2 ExamplesExercisesFinal
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## 5. Summarizing the formulasThe key to verifying identities is very good formula usage. Besides good memorization and understanding of all formulas, we need to summarize the actions of formulas. In our minds, we must clearly know what we can do, what we can't do. For examples, we have four Sum-to-Product formulas: What characteristics do the formulas have? We see that any sum
can become a product, if the functions of two angles are the same,
(both are The answer of first question is yes. In fact, we can use the Derived
formula which reaches the goal from sum to product. The answer of second question is yes. We have After factoring the same coefficient, the form in parentheses is exactly the form of the Sum to Product formulas. By using formulas, we have realized the goal of sum to product. |
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