Trigonometry: Product Identities

in mathematics •  2 months ago  (edited)

In this video I go over the trig product identities and provide a simple proof for them. The identities I cover are listed below:

sin(x)cos(y) = 1/2 [sin(x+y) + sin(x-y)]
cos(x)cos(y) = 1/2[cos(x+y) + cos(x-y)]
sin(x)sin(y) = 1/2[cos(x-y) - cos(x+y)]

In proving the above identities I make use of the identities which I covered in my earlier video, specifically the identities for sin(x+/-y) and cos(x+/-y).


Watch Video On:

Download Video Notes: http://1drv.ms/1DZu6XH


View Video Notes Below!


Download These Notes: Link is in Video Description.
View These Notes as an Article: https://steemit.com/@mes
Subscribe via Email: http://mes.fm/subscribe
Donate! :) https://mes.fm/donate

Reuse of My Videos:

  • Feel free to make use of / re-upload / monetize my videos as long as you provide a link to the original video.

Fight Back Against Censorship:

  • Bookmark sites/channels/accounts and check periodically
  • Remember to always archive website pages in case they get deleted/changed.

Join my private Discord Chat Room: https://mes.fm/chatroom

Check out my Reddit and Voat Math Forums:

Buy "Where Did The Towers Go?" by Dr. Judy Wood: https://mes.fm/judywoodbook
Follow My #FreeEnergy Video Series: https://mes.fm/freeenergy-playlist
Watch my #AntiGravity Video Series: https://steemit.com/antigravity/@mes/series

  • See Part 6 for my Self Appointed PhD and #MESDuality Breakthrough Concept!

Follow My #MESExperiments Video Series: https://steemit.com/mesexperiments/@mes/list


NOTE #1: If you don't have time to watch this whole video:

NOTE #2: If video volume is too low at any part of the video:


Trigonometry: Product Identities

Trigonometry Product Identities.jpeg

Proof:

Authors get paid when people like you upvote their post.
If you enjoyed what you read here, create your account today and start earning FREE STEEM!