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07-02-2018
Mathematics

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Find a ·
b. |a| = 3, |b| = 14 , the angle between a and b is 45°

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07-02-2018

a.b
[tex]=|a||b|cos(theta)[/tex]
[tex]=3*14*cos(45)[/tex]
[tex]=3*14*\sqrt{2}/2[/tex]
[tex]=21\sqrt{2}[/tex]

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