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Thread: Find a*b

  1. January 11th 2008, 01:59 PM #1
    viet
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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. January 11th 2008, 02:02 PM #2
    Plato
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    \cos \left( \phi \right) = \frac{{a \cdot b}}{{\left\| a \right\|\left\| b \right\|}}<br />
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