What is the cosine of the angle theta between vectors vec p = (2, 2, 1) and vec q = (1, 2, 2)?

What is the cosine of the angle $θ$ between vectors $p = (2, 2, 1)$ and $q = (1, 2, 2)$ ?

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Find the cross product $a \times b$ for vectors $a = (1, 0, 0)$ and $b = (0, 1, 0)$ in the standard Cartesian coordi…
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