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Problem
Problem
If in a
△
A
B
C
\triangle ABC
△
A
B
C
,
A
D
,
B
E
AD, BE
A
D
,
B
E
and
C
F
CF
C
F
are the altitudes and
R
R
R
is the circumradius, then find the radius of the
D
E
F
DEF
D
E
F
.
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