What is the sum of the squares of direction cosines of the line joining the points (1, 2,-3) and (-2, 3, 1)?

Question Asked by a Student from EXXAMM.com Team

Q 2359645514.     What is the sum of the squares of direction
cosines of the line joining the points (1, 2,-3) and (-2, 3, 1)?
NDA 2012 Paper 1
A

0

B

1

C

3

D

2/(sqrt (26))

HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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