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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.

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