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Problem
Problem
In any
Δ
A
B
C
\Delta ABC
Δ
A
B
C
, if
cot
A
2
,
cot
B
2
,
cot
C
2
\cot \frac{A}{2}, \cot \frac{B}{2}, \cot \frac{C}{2}
cot
2
A
,
cot
2
B
,
cot
2
C
are in AP, then
a
,
b
,
c
a, b, c
a
,
b
,
c
are in a. AP b. GP c. HP d. None of these
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