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Math Help - Product Dot Vectors

  1. #1
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    Product Dot Vectors

    Given "a" and "b" unit vectors,

    a) if the angle between them is 60 degrees, calculate (6a + b) product dot (a - 2b)


    I'm clueless about this question.
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  2. #2
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    Quote Originally Posted by Macleef View Post
    Given "a" and "b" unit vectors,

    a) if the angle between them is 60 degrees, calculate (6a + b) product dot (a - 2b)
    Now use \cos (60^ \circ  ) = \frac{{a \cdot b}}{{\left\| a \right\|\left\| b \right\|}} = a \cdot b to finish.
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