Angle addition formulae

Here's a visualization of the angle addition formulae, [math]\sin(\alpha+\beta)=\sin \alpha \cos \beta + \cos \alpha \sin\beta [/math] and [math]\cos(\alpha+\beta)=\cos \alpha \cos \beta - \sin \alpha \sin\beta [/math], in the first quadrant of the unit circle. Start the slider at step 1, answer the questions as they appear, and you should be able to follow the argument. Prerequisite: basic understanding of right triangle trigonometry and unit circle trigonometry.

 

Jon Dreyer

 
Resource Type
Activity
Tags
addition  angle  cos  cosine  formulas  fórmulas  sin  sine  trigonometry 
Target Group (Age)
15 – 19+
Language
English
 
 
 
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