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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)/6`

B

`(pi)/4`

C

`(pi)/3`

D

`(2pi)/(5)`

Text Solution

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The correct Answer is:
C
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