Trig identity proofs: cos(A+B) = cosAcosB - sinAsinB

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Australia Magic Monk
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Published on ● Video Link: https://www.youtube.com/watch?v=o6Ye4x9CFTY


Duration: 12:32
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In this series of videos I will prove every single trigonometric identity. If you have any that you want to see the proof of, feel free to e-mail me. I suggest starting from the beginning so if you are stuck watching this video, go back to some earlier ones (e.g. the proof of sin(A+B) is here https://www.youtube.com/watch?v=mO-2D-L4yc8)



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Tags:
trigonometry identity proof
trigonometric identities