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Find the angle between the lines vecr ...

Find the angle between the lines
`vecr = (hati+hatj)+lambda (hati+hatj+hatk)and vecr=(2hati-hatj)+t(2hati+3hatj+hatk)`

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The correct Answer is:
`cos^(-1)(6/(sqrt(42)))`
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AAKASH INSTITUTE-THREE DIMENSIONAL GEOMETRY -TRY YOURSELF
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