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Find the angle between the following pair of lines: A lines with direction ratios 2,2,1 A line joning (3,1,4)to (7,2,12)

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Find the angle between the following pair of lines: A lines with direction ratios 2,2,1 A line joning (3,1,4)to (7,2,12)
A. `cos^(-1)(1/3)`
B. `cos^(-1)(2/3)`
C. `cos^(-1)(3/3)`
D. `cos^(-1)(4/3)`
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Correct Answer - B
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