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Problem
Problem
If
tan
−
1
4
+
tan
−
1
5
=
cot
−
1
λ
\tan^{-1} 4 + \tan^{-1} 5 = \cot^{-1} \lambda
tan
−
1
4
+
tan
−
1
5
=
cot
−
1
λ
, then find '
λ
\lambda
λ
'.
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