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Why is it so that If delta is 0 then, h^2-ab>0 real interesting lines h^2-ab=0 parallell lines?

Why is it so that If delta is 0 then,
h^2-ab>0 real interesting lines
h^2-ab=0 parallell lines?
 

Grade:12

1 Answers

Arun
25763 Points
2 years ago
Dear student
 
As we see angle between two lines 
 
tan theta = 2 sqrt(h^2 – ab)  / (a+ b)
 
now if h^2 – ab > 0 then lines are real intersecting as angle is non zero. but if h^2 – ab = 0 yhen anhle are zero hence coincident lines

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