The angle between the two lines lx+my+n=0 and l’x+m’y+n’=0 is given by \tan^{–1}\theta . What \theta equal to? [NDA II 2018]

Correct Answer is : |lm′−l′mll′+mm′|

NDA Math Coordinate System and Straight Line

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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?

[NDA II 2018]

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