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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)`

Text Solution

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The correct Answer is:
A
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