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## 4. Understanding the formulas--Page 2We know the Double-Angle formula ofcosine:
which show us the relationship between angles
and .
These three presentations are not different essentially. Using
the formula ,
we can get one form from other two forms. Now from the idea of
transforming the three differences, we understand how to use these
three formulas. If we want to transform
to
and The Sum to Product formulas are as following: In section
3, we told you how to memorize these four formulas. Of course,
the first role of these formulas is changing sum to product from
the left to the right. Now we need to know what kinds of functions
can transform to the others, and as well as the angles. From the
formulas we see, We can not explain every formula for you. We believe that you can analyze every formula like we did. After you read our eliciting explanation above, please complete the analysis of all formulas, which is important for you to solve problems. |
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