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Mathematics
Problem
Find the distance between the foci of the ellipse
9
x
2
+
16
y
2
=
144
9x^{2}+16y^{2}=144
9
x
2
+
16
y
2
=
144
. a)
4
7
4\sqrt{7}
4
7
b)
8
8
8
c)
2
7
2\sqrt{7}
2
7
d)
10
10
10
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