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Quiz 1\quad Sept. 1/3, 1992\cr
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1. Find the length of the long diagonal of the parallelogram with sides given by the vectors $(1,2,3)$ and $(3,5,7)$ located at the origin.
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2. If the angle between two unit vectors $\a$ and $\b$ is $\pi/6$, what is their dot product, $\a \bdot \b$?

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