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NDA Math Coordinate System and Straight Line

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Question : 34

Total: 92

The angle between the two lines lx+my+n=0 and l’‌x+m’‌y+n’=0 is given by tan–1θ . What θ equal to?

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lm′−l′m
ll′−mm′
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|‌‌
lm′+l′m
ll′+mm′
|
|‌‌
lm′−l′m
ll′+mm′
|
|‌‌
lm′+l′m
ll−mm′
|

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