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Show that the lines with direction cosines 1213, −313, −413; 413, 1213, 313; 313, −413, 1213 are mutually perpendicular. |
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Answer» Show that the lines with direction cosines 1213, −313, −413; 413, 1213, 313; 313, −413, 1213 are mutually perpendicular. |
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