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Mathematics
Problem
State the constant value of the sum of the distances from any point on the ellipse
x
2
a
2
+
y
2
b
2
=
1
\dfrac{x^{2}}{a^{2}}+\dfrac{y^{2}}{b^{2}}=1
a
2
x
2
+
b
2
y
2
=
1
to its two foci.
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