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Find the angle between the following lin...

 Find the angle between the following lines ` vecr=3veci+2vecj-veck+t(veci+2vecj+2veck) ` and  ` vecr=5vecj+2veck+s(3veci+2vecj+6veck) `

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The correct Answer is:
`theta = cos^(-1) (19/21)`
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