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If the d.c's of two lines are such that ...

If the d.c's of two lines are such that l+3m+n = 0, `3l^(2) + 5m^(2) - 4n^(2) = 0`, then the angle between them is

A

`pi//3`

B

`pi//2`

C

`pi//4`

D

`pi//6`

Text Solution

Verified by Experts

The correct Answer is:
B
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  7. If the d.c's of two lines are such that l+3m+n = 0, 3l^(2) + 5m^(2) - ...

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