Direction Command

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Direction( <Line> )
Yields the direction vector of the line.
Example: Direction(-2x + 3y + 1 = 0) yields the vector \mathrm{\mathsf{ u= \begin{pmatrix} 3 \\ 2 \end{pmatrix} }}
Note: A line with equation ax + by = c has the direction vector (b, - a).
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