1.

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

Answer»

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



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