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Mathematics
Mathematics
Problem
Show that
tan
−
1
(
1
2
)
+
tan
−
1
(
2
11
)
=
tan
−
1
3
4
\tan^{-1}\left(\frac{1}{2}\right) + \tan^{-1}\left(\frac{2}{11}\right) = \tan^{-1}\frac{3}{4}
tan
−
1
(
2
1
)
+
tan
−
1
(
11
2
)
=
tan
−
1
4
3
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