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Acute angle between the lines (x-1)/l=(y...

Acute angle between the lines `(x-1)/l=(y+1)/m=z/n` and `(x+1)/m=(y-3)/n=(z-1)/l` where `l > m > n` and `l ,m ,n` are the roots of the cubic equation `x^3+x^2-4x=4` is equal to: `cos^(-1)4/9` (b) `sin^(-1)(sqrt(65))/9` `2cos^(-1)sqrt((13)/(18))` (d) `cot^(-1)4/(65)`

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