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\textbf{Math 225: Calculus III}
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\textbf{Quiz 1}\quad \textsl{Jan. 23/25, 1996}
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\begin{enumerate}
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\item 
Find a unit vector that points from $(1,-2,3)$ to $(-2,3,1)$.

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\item 
Find the angle between the vectors $\a =  -2\i + 2\k$ and $\b = \i - \j$.

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