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4. Understanding the formulas--Page 2We know the Double-Angle formula of cosine:which show us the relationship between angles
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, sine plus
or minus sine changes to
sine times cosine;
cosine plus cosine
to cosine times cosine;
cosine minus cosine
to sine times sine;
and 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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