Proof of Compound Angle Identity sin(x+y)

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**At about 6:45 I say "opposite over adjacent" when I meant "opposite over hypotenuse". Sorry about that!

This video is a geometric proof of the Compound Angle identity sin(x+y) = sinx cosy + cosx siny. It is step by step, and requires only knowledge of basic trigonometry and algebra fundamentals to understand.
  1. Brooke Townsend
  2. math
  3. townsend
  4. compound angle
  5. proof
  6. trigonometry
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