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).
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIid4le5eHtdGQmz0tBg?e=xHVarf
View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-sinx-y-sinxcosy-cosxsiny
Related Videos:
Trigonometry Identities: Addition and Subtraction Identities - cos(x + y) and cos(x - y): http://youtu.be/VuQczhk7HOs
Trigonometry Identities: sin(-x) = - sin(x) and cos(-x) = cos(x): http://youtu.be/tD5EA2SXyFQ
Trigonometry: Proof of Law of Cosines (and Pythagorean Theorem): http://youtu.be/wOCYb3Ku6yw
Trigonometry: Sine, Cosine and Tan Functions: http://youtu.be/WKTIlF2oWw8
Trigonometry Identities: cos(2π + x), sin(2π + x), cos(π/2 -x), sin(π/2 -x): http://youtu.be/EynSefQs308 .
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I don't always derive trigonometric identities but when I do I usually use previously derived identities in the proof ;)
View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-sinx-y-sinxcosy-cosxsiny
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