[" 13.Show that the lines with direction...

[" 13.Show that the lines with direction cosines "],[qquad <(12)/(13),-(3)/(13),-(4)/(13)>,<(4)/(13),(12)/(13),(3)/(13)>" and "<(3)/(13),-(4)/(13),(12)/(13)>" are mutually perpendicular."]

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