1.

If the angle between the lines whose direction cosines are ((2)/(sqrt(21)), (C )/(sqrt(21)), (1)/(sqrt(21))) and ((3)/(sqrt(54)), (3)/(sqrt(54)), (6)/(sqrt(54))) is (pi)/(2) then the value of C is

Answer»

6
4
`-4`
2

Answer :B


Discussion

No Comment Found

Related InterviewSolutions