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Let the direction cosines of two lines satisfy the equations: \(4l+m-n=0\) and \(2mn+10nl+3lm=0\). Then the cosine of th…

Q1

Let the direction cosines of two lines satisfy the equations: \(4l+m-n=0\) and \(2mn+10nl+3lm=0\). Then the cosine of the acute angle between these lines is:

a

\(\frac{20}{3\sqrt{38}}\)

b

\(\frac{10}{3\sqrt{38}}\)

c

\(\frac{10}{\sqrt{38}}\)

d

\(\frac{10}{7\sqrt{38}}\)

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