1.

Givne lines are (x-1)/(l) = (y + 1)/(m) = z/n and (x+1)/(m) = (y-3)/(n) = (z-1)/(l) where l gt m gt n l,m, n are roots of the equation x^3 + x^2 -4 x = 4 then the angle between them is ........

Answer»

`pi/2`
`COS^(-1)(1/4)`
`cos^(-1)(-4/9)`
`cos^(-1)(5/9)`

ANSWER :C


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