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The angle between the lines whose direc...

The angle between the lines whose direction cosines satisfy the equation `l+m+n=0` and `l^(2)=m^(2)+n^(2)` is

A

`(pi)/(4)`

B

`(pi)/(6)`

C

`(pi)/(2)`

D

`(pi)/(3)`

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The correct Answer is:
D
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