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Problem
Problem
Find the equations of the straight lines touching both
x
2
+
y
2
=
2
a
2
x^2 + y^2 = 2a^2
x
2
+
y
2
=
2
a
2
and
y
2
=
8
a
x
y^2 = 8ax
y
2
=
8
a
x
.
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