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Math Help - Find a*b

  1. #1
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    Find a*b

    find a*b if
    |a| = 4, |b|=8, and the angle between a and b is [pi/-9] radians.

    a*b=
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  2. #2
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    \cos \left( \phi  \right) = \frac{{a \cdot b}}{{\left\| a \right\|\left\| b \right\|}}<br />
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