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If the directin cosines of two lines sat...

If the directin cosines of two lines satisfy the equation `l + m + n =0 and 2lm + 2ln - m n =0,` then the acute angle between those two lines is

A

`pi/4`

B

`pi/3`

C

`pi/6`

D

`(2pi)/(5)`

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The correct Answer is:
B
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