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UPSC NDA I 2010 Mathematics Paper
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© examsnet.com
Question : 42
Total: 120
A circle is drawn with the two foci of an ellipse
x
2
a
2
+
y
2
b
2
=
1
at the end of the diameter. What is the equation to the circle?
x
2
+
y
2
=
a
2
+
b
2
x
2
+
y
2
=
a
2
−
b
2
x
2
+
y
2
=
2
(
a
2
+
b
2
)
x
2
+
y
2
=
2
(
a
2
−
b
2
)
Validate
Solution:
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