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The given equation can be written as
tanx+
1−tanxtan
3
π
tanx+tan
3
π
+
1−tanxtan
3
2π
tanx+tan
3
2π
=3
⇒tanx+
1−
3
tanx
tanx+
3
+
1+
3
tanx
tanx−
3
=3
⇒tanx+
1−3tan
2
x
8tanx
=3
⇒
1−3tan
2
x
tanx(1−3tan
2
x)+8tanx
=3
⇒
1−3tan
2
x
3(3tanx−tan
3
x)
=3
⇒3tan3x=3⇒tan3x=1
⇒3tan3x=3⇒tan3x=1
⇒3x=nπ+
4
π
⇒x=
3
nπ
+
12
π
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