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## Homework Statement

My prof gave me a homework assignment and i don't really understand how to do the question.

You are give two vectors [tex]\vec{A}[/tex]=(3,1,-3) and[tex]\vec{B}[/tex]=(-2,3,4)

a) Find the angle between the two vectors

b) Find all the unit vectors (if there are more than one) perpendicular to both vectors.

## Homework Equations

[tex]\vec{A}[/tex]x[tex]\vec{B}[/tex]=(A[tex]_{y}[/tex]B[tex]_{z}[/tex]-A[tex]_{z}[/tex]B[tex]_{y}[/tex])[tex]\hat{i}[/tex]-etc(don't feel like typing it all out, you guys know what i mean)

## The Attempt at a Solution

I drew out graphs (sort of) of the vectors to get a grasp on it. I'm not sure what it's asking for in part b) of the question. And I have NO idea how to find the angles between the lines.