Trigonometry Identities: sin(x +/- y) = sin(x)cos(y) +/- cos(x)sin(y)

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In this video I use the cos(x - y) identity which I proved in my earlier video to derive a very useful trigonometric identity for sin(x + y) and sin(x -y).

Related Videos:

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  1. Math Easy Solutions
  2. trigonometry
  3. trig
  4. trig identity
  5. sine
  6. cosine
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I don't always derive trigonometric identities but when I do I usually use previously derived identities in the proof ;)

mes