Published by:
CGP EDU Academic Team
Published on: August 12, 2026
In a triangle 
, then angle 
, is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Rearrange the given equation:
Use the sum-to-product formula for 
and the half-angle formula for 
:
In a triangle, 
, so 
This gives 
:
Since 
, divide both sides by 
:
Equating the angles gives 
Substitute 
into 
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