In this video I prove the two identities, sin(-x) = - sin(x) and cos(-x) = cos(x), which show that cosine is an even function while sine is an odd function.
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Related Videos:
Trigonometry Identities: cos(x +/- y) = cos(x)cos(y) -/+ sin(x)sin(y) : http://youtu.be/VuQczhk7HOs
Trigonometry: Proof of Law of Cosines (and Pythagorean Theorem): http://youtu.be/wOCYb3Ku6yw
Trigonometry Identities: cos and sin of angles (2p + x) and (p/2 -x): http://youtu.be/EynSefQs308
Trigonometry Identities: sin(x +/- y) = sin(x)cos(y) +/- cos(x)sin(y): http://youtu.be/edtk9thfwbM
Trigonometry: Sine, Cosine and Tan Functions: http://youtu.be/WKTIlF2oWw8 .
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I don't always go over sine and cosine trigonometric identities but when I do I usually show that sine is odd and cosine is even ;)
View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-sine-cosine-even-odd-functions
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