Badiuddin askIITians.ismu Expert
Last Activity: 14 Years ago
Dear Vaibhav
we know that tangent on ellipse is
y=mx+ √(a2m2+b2)
simplify it
m2( x2 -a2 ) -2mxy + y2 -b2=0
m1 +m2 = tanθ1 +tan θ2 = 2xy/(x2 -a2 ) ...............1
m1.m2 =tanθ1tan θ2 = y2 -b2/(x2 -a2 )......................2
divide 1 and 2
1/ tanθ1 +1/tan θ2 =2xy/y2 -b2
k=2xy/y2 -b2
2xy =k(y2 -b2)
so option c is correct
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