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By considering
tan
(
A
+
B
)
=
tan
A
+
tan
B
1
−
tan
A
tan
B
when
A
=
x
and
B
=
x
,
prove that
tan
(
2
x
)
=
2
tan
x
1
−
tan
2
x
Hence, or otherwise, solve the equation
tan
x
tan
2
x
=
1
,
0
<
x
<
π