Home |
Normal
Version IE Version |
Search | BBS | Guest Book | Site Map | Help | Contact us | About us |

IntroductionEssenceMemorizingUnderstandingSummarizingExamplesExercisesFinal thoughts |
## 4. Understanding the formulas--Page 4Using the Sum
and Difference formulas, we can easily get the ,
if ,
if Here T can be any trigonometric functions, and co-T is the co-function
of function T. For example, For example and so on, all of such formulas can proved by the Sum and Difference formulas: , since . since , and so on. In the same way we can prove all of them. |
|||

LWR

Questions? Comments? Contact
us.

© Copyright 1998 LWR, ThinkQuest team
17119. All rights reserved.