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The angle between the lines whose direction cosines are given by the equations \(3 l+m+5 n=0\) and \(6 n m-2 n l+5 l m=0…

Q1

The angle between the lines whose direction cosines are given by the equations \(3 l+m+5 n=0\) and \(6 n m-2 n l+5 l m=0\) is:

a

\(\cos ^{-1}\left(\frac{1}{6}\right)\)

b

\(\cos ^{-1}\left(-\frac{1}{6}\right)\)

c

\(\cos ^{-1}\left(\frac{2}{3}\right)\)

d

\(\cos ^{-1}\left(-\frac{5}{6}\right)\)

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