1. Show that the three lines with direction cosines12 -3 4 4 12 3 3 -4 – InterviewSolution

1.	1. Show that the three lines with direction cosines12 -3 4 4 12 3 3 -4 1213' 13' 13' 13' 13'1·ー---一·13' 13' 13 13 are mutually perpendicular.·
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