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20 May, 09:51

Find a ·

b. |a| = 8, |b| = 7, the angle between a and b is 2π/3

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  1. 20 May, 11:39
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    By definition we have that the scalar product of two vectors is given by:

    a. b = | a |. | b |. cos (angle)

    Substituting the values

    a. b = (8) * (7) * (cos (2π / 3)) = - 28
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