The direction cosines of the vector 3hat...

The direction cosines of the vector `3hati-4hatj+5hatk` are

A

`3/sqrt2,(-4)/sqrt2,1/sqrt2`

B

3/5, (-4)/5, 1/5

C

`3/(5sqrt2),4/(5sqrt2),1/sqrt2`

D

`3/(5sqrt2),(-4)/(5sqrt2),1/sqrt2`

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The correct Answer is:

D

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