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The angle between the lines whose direc...

The angle between the lines whose direction cosines are given by l + m + n = 0 and `l^2 = m^2 + n^2` is .....

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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