the value of 1-tan²13°/1+tan²13° is
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shows tan−1(1)+tan−1(2)+tan−1(3)=
tan
−
1
(
1
)
+
tan
−
1
(
2
)
+
tan
−
1
(
3
)
=
π
. I know tan−1(1)=/4
tan
−
1
(
1
)
=
π
/
4
, but how could you compute that tan−1(2)+tan−1(3)=34
tan
−
1
(
2
)
+
tan
−
1
(
3
)
=
3
4
π
to get this result?
tan
−
1
(
1
)
+
tan
−
1
(
2
)
+
tan
−
1
(
3
)
=
π
. I know tan−1(1)=/4
tan
−
1
(
1
)
=
π
/
4
, but how could you compute that tan−1(2)+tan−1(3)=34
tan
−
1
(
2
)
+
tan
−
1
(
3
)
=
3
4
π
to get this result?
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