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Problem
Problem
If median
A
D
AD
A
D
of a triangle
A
B
C
ABC
A
B
C
makes angle
π
6
\frac{\pi}{6}
6
π
with side
B
C
BC
B
C
, then the value of
(
cot
B
−
cot
C
)
2
(\cot B - \cot C)^2
(
cot
B
−
cot
C
)
2
is equal to a. 6 b. 9 c. 12 d. 15
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