Angle addition formulae
- Author:
- Jon Dreyer
- Topic:
- Addition, Angles, Cosine, Sine, Trigonometry
Here's a visualization of the angle addition formulae, and , 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.