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If the coordinates of the points `A ,B ,C ,D` are `(1,2,3),(4,5,7),(-4,3,-6)` and `(2,9,2),` then find the angle between `A B` and `C Ddot`

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RD SHARMA ENGLISH-DIRECTION COSINES AND DIRECTION RATIOS-All Questions
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  16. Find the angle between the vectors with direction ratios proportion...

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  17. Determine the point in XY-plane which is equidistant from thee poin...

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  18. Find the angle between the lines whose direction cosines are given b...

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