1.

If the direction cosines of two lines are given by l + 3m +5n=0 and 5lm - 2mn + 6lm = 0, then the angle between the lines is

Answer»

`cos^(-1) ((1)/(6))`
`cos^(-1) ((1)/(3))`
`cos^(-1) ((1)/(5))`
`sin^(-1) ((1)/(6))`

Answer :A


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