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OpenStudy (anonymous):
use the concepts of cofunctions and complements to derive formulas for sin(A+B) and sin(A-B)
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OpenStudy (dumbcow):
http://en.wikipedia.org/wiki/File:AngleAdditionDiagram.svg this shows formula for sin(A+B) then use fact that cos(-B) = cosB , sin(-B) = -sinB to derive sin(A-B)
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