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x^2/16+y^2/9=1
a^2=16 , b^2=9
b^2=a^2(1-e^2)
b^2=a^2-a^2.e^2
a^2.e^2=a^2-b^2=16–9=7
ae=+/-(7)^1/2
F(+/-ae,0) or (+/-7^1/2,0)
Eq. Of circle is:-
(x-x1)^2+(y-y1)^2=r^2
(x-0)^2+(y-3)^2=[(+/-7^1/2–0)^2+(0–3)^2]
x^2+y^2–6y+9=[7+9]
x^+y^2–6y+9–16=0
x^2+y^2–6y-7=0 ,
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