Comprehension Passage
The projections of a directed line segment on the coordinate axes are 12, 4, 3 respectively.
What are the direction cosines of the line segment?
1
{12/13, 4/13, 3/13}
2
{12/13, -4/13, 3/13}
3
{12/13, -4/13, -3/13}
4
{-12/13, -4/13, 3/13}