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The direction cosines of two lines satis...

The direction cosines of two lines satisfy `2l+2m-n=0` and `lm+mn+nl=0`. The angle between these lines is

A

`(pi)/(4)`

B

`(pi)/(2)`

C

`(pi)/(6)`

D

`(pi)/(3)`

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The correct Answer is:
B
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