In this video I show some very useful trigonometric identities which basically involve shifting the sine or cosine functions by either 2π or 360 degrees and π/2 or 90 degrees. Make sure you understand these and keep them in mind because I will use these many times in later videos.
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIid5Pcbv5kjFDPGK2iw?e=lVefWO
View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-cos-sin-of-2pi-x-and-pi-2-x
Related Videos:
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: sin(x +/- y) = sin(x)cos(y) +/- cos(x)sin(y): http://youtu.be/edtk9thfwbM
Exact Trigonometry Ratios Part 1: 0, 30, 45, 60, and 90 Degrees: http://youtu.be/ln03a5KvQAY .
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I don't always prove trigonometric identities but when I do I usually rotate a line by the angle specified in the identity and determine the new trig ratios ;)
View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-cos-sin-of-2pi-x-and-pi-2-x
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