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Trigonometric transformations
Question
cos
2
B
=
cos
(
A
+
C
)
cos
(
A
−
C
)
⇒
tan
A
,
tan
B
,
tan
C
are in
Moderate
A
A.P.
B
H.P.
C
G.P.
D
A.G.P
Solution
Apply componendo and dividendo
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