The direction cosines of a vector a are ...

The direction cosines of a vector a are `cos alpha = 4/(5sqrt(2)), cos beta =1/sqrt(2)` and `cos gamma =3/(5sqrt(2))` then the vector `vecA` is

A

`4hati + hatj + 3hatk`

B

`4hati +5hatj + 3hatk`

C

`4hati - 5hatj - 3hatk`

D

`hati + hatj - hatk`

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The correct Answer is:

B

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