# Math Help - Unit Vectors

1. ## 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