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Find the angle between the lines barr=3b...

Find the angle between the lines `barr=3bari-2barj+6bark+lambda(2bari+barj+2bark)` and `barr=(2barj-5bark)+mu(6bari+3barj+2bark).`
Hint for solution : Angle between line `barr=a_1+lambda barb_1` and `r=bara_2+mubarb_2` then angle between them is obtained from `cos theta=(|b_1.b_2|)/(|b_1|.|b_2|)`.

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Verified by Experts

The correct Answer is:
`=cos^(-1)((19)/(21))`
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KUMAR PRAKASHAN-THREE DIMENSIONAL GEOMETRY-SOLUTION OF NCERT EXAMPLAR PROBLEMS (Short Answer Type Question)
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