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Cos
a B
1
Cosa
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Sin a B
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Cos a B
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Cos
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Cosb
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Con Sam
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3:52
YouTube
john kinny-lewis
Derivation of cosA+cosB and cosA-cosB
The derivation of cosA+cosB and cosA-cosB is explained using the basic rules that sin(90-A)=cosA, sin(-A)=-sinA and cos(-A)=cosA. For more videos, ebooks and books please visit harderhscmaths.com
19.6K views
Feb 5, 2015
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