The angle between the lines whose dir...

The angle between the lines whose direction cosines satisfy the equations `l+m+n=""0` and `l^2=m^2+n^2` is (1) `pi/3` (2) `pi/4` (3) `pi/6` (4) `pi/2`

A

`pi/3`

B

`pi/4`

C

`pi/6`

D

`pi/2`

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The correct Answer is:

A

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