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

`4hati+hatj+3hatk`

`4hati+5hatj+3hatk`

`4hati-5hatj-3hatk`

`hati+hatj-hatk`

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AAKASH SERIES-MOTION IN A PLANE-EXERCISE-2 (Addition, Subtraction and Resolution)

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