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LBRY Claims • cos-a-b-cosacosb-sinasinb-proof

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7 Nov 2019 20:29:49 UTC
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cos(A-B)=cosAcosB+sinAsinB proof
cos(A-B)=cosAcosB+sinAsinB proof

Video related to cos(α+β)=cosαcosβ-sinαsinβ:

https://www.youtube.com/watch?v=-n6h6-CT0-0

Also, remember that:

cos(-θ) = cos(θ)

...
https://www.youtube.com/watch?v=nFuU4v425Zc
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