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Scalar product proof. b l. q. b. a. q. a l. b l = b Cos q b Sin q. a l = a 0. a l . b l = (a*b Cos q ) + (0 * b Sin q ). So a l . b l = abCos q. Since a . b = a l . b l. Then a . b = a b Cos q. - PowerPoint PPT Presentation
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Scalar product proof
b a
bl
al
al = a 0
bl = b Cos b Sin
Since a . b = al . bl
al . bl = (a*b Cos) + (0 * b Sin)So al . bl = abCos
Then a . b = a b Cos
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