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2 pairs of lines L1L2=0 & L3L4=0 r equally inclined if da angle btw L1=0 & L3=0 equal to
angle btw L2=0 & L4=0.
The lines represented by x2+2@xy +2y2=0 and the lines represented by (1+@)x2-8xy+y2=0 are equally incline then calculate prove that @=±2
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3 Answers
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62angle between two lines is given by
(m1-m2)/(1+m1m2)
for a quadratic,
m1-m2=√b2-4ac /2a
m1m2=c/a
Convert to this form and just put in these values :)
62the above expression is not exactly angle but tan of the angle..
so i have sort of assumed that equal angles means equal values of tan of those angles! :)
