The angle between the pair of lines `vec(r)= hat i+ hat j- hat k+ lambda( hat i+2 hat j+3 hat k) ` and ` vec(r)= 3 ha

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Q 1413878740.     The angle between the pair of lines

`vec(r)= hat i+ hat j- hat k+ lambda( hat i+2 hat j+3 hat k) ` and ` vec(r)= 3 hat i- hat j+ hat k+ mu( hati + hat j+ hat k)` is

(This question may have multiple correct answers)

A `cos^-1( 6/ sqrt 42)`
B `sin^-1( 1/ sqrt7)`
C `cos^-1(3/sqrt42)`
D None of these

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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