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Problem
Problem
The value of
cot
{
∑
n
=
1
23
cot
−
1
(
1
+
∑
k
=
1
n
2
k
)
}
\cot \left\{ \sum_{n=1}^{23} \cot^{-1} \left( 1 + \sum_{k=1}^{n} 2k \right) \right\}
cot
{
∑
n
=
1
23
cot
−
1
(
1
+
∑
k
=
1
n
2
k
)
}
is a.
23
25
\frac{23}{25}
25
23
b.
25
23
\frac{25}{23}
23
25
c.
23
24
\frac{23}{24}
24
23
d.
24
23
\frac{24}{23}
23
24
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