1.

a,b and c are three unit vectors such that no two of them are collinear. If b=2 {axx(bxxc)} and alpha is the angle between a,c and beta is the angle between a,c and beta is the angle between a,b then cos (alpha+beta) =

Answer»

`(sqrt(3))/(2)`
`-(sqrt(3))/(2)`
`(1)/(2)`
`-(1)/(2)`

ANSWER :B


Discussion

No Comment Found

Related InterviewSolutions