1.

If the d.c's (l,m,n) of two lines are connected by the relations 3l+m+5n=0, 6mn - 2nl + 5lm=0 then the angle between the lines is

Answer»

`COS^(-1)((1)/(6))orpi-cos^(-1)((1)/(6))`
`45^(@)`
`60^(@) or 120^(@)`
`cos^(-1)""(19)/(SQRT(364))`

Answer :A


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