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A vector vec r has length 21 and its di...

A vector ` vec r` has length 21 and its direction ratios are proportional to `2,-3,6.` Find the direction cosines and components of ` vec r` , is given that ` vec r` Makes an acute angle with `x-a xi sdot`

Text Solution

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