1 Answers
navyasri veluri
·2008-11-23 05:31:55
u can identify it by considering te pts
that is s11
for a parabola
if it is greater than 0 thenthe normals will be 2
if it is less than 0 it will be 3 like that
imlarly for ellipse and hyperbola
or u have a formula but only for parabola
if H=2a-x1/3a G=-y1/a and Δ =G^2+4H^3
THEN FOR Δ>0 normals=1
Δ=0 normals=2
Δ<0 normals=3