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A vector vec( r ) has length 21 and dire...

A vector `vec( r )` has length 21 and directi9on ratio `2,-3,6`. Find the direction cosines and components of `vec( r )` given that `vec( r )` makes an acute angle with X- axis.

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The correct Answer is:
`r=3(-2hat(i)+3hat(j)-6hat(k))`
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