If the lines x=k(1)y+k(2),z=k(3)y+k(4) a...

If the lines `x=k_(1)y+k_(2),z=k_(3)y+k_(4)` and `x=k'_(1)y+k'_(2), z=k'_(3)y+k'_(4)` are parallel lines then `[cos^(-1)(k_(1)k'_(3)-k'_(1)k_(3))]` is equal to (where `[.]` represents the greatest integer function)

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