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Math Help - Unit Vectors

  1. #1
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    Jun 2010
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    Unit Vectors

    Hi. I'm having trouble with this question:

    Two unit vectors make an angle of 75 with one another. Find |3a+2b|.

    I know that the dot product of two unit vectors will equal the cosine of the angle between them, but I just don't know how to apply that.

    Help would be appreciated, thanks. Also sorry for posting in the wrong section originally.

    Edit: Well, found my answer searching through the forum:http://www.mathhelpforum.com/math-he...s-problem.html

    Can close this thread or whatever
    Last edited by SoftSoap; June 8th 2010 at 09:34 PM.
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