Consider the following:
Let P (-2, 1, -5) & Q (4, -3, -1) be two points in a 3D space
1. The direction ration of the line segment PQ are < 3, -2, 2>
2. The sum of the squares of direction cosines of the line segment PQ is unity.
Which of the above statements is/are correct?1
1 only
2
2 only
3
Both 1 and 2
4
Neither 1 nor 2