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[" Show that the three lines with direct...

[" Show that the three lines with direction cosines "],[[(12)/(13),(-3)/(13),(-4)/(13);(4)/(13),(12)/(13),(3)/(13);(3)/(13),(-4)/(13),(12)/(13)" are mutually perpendicular."],[" Show that the line through the points "]]

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Show that the three lines with direction cosines quad (12)/(13),(-3)/(13),(-4)/(13),(4)/(13),(12)/(13),(3)/(13);(3)/(13),(-4)/(13),(12)/(13) are mutually perpendicular.

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