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Problem
Problem
If in a
Δ
A
B
C
\Delta ABC
Δ
A
B
C
,
3
a
=
b
+
c
3a = b + c
3
a
=
b
+
c
, then the value of
cos
B
2
cot
C
2
\cos \frac{B}{2} \cot \frac{C}{2}
cos
2
B
cot
2
C
is a. 1 b.
3
\sqrt{3}
3
c. 2 d. None of these
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