Published by:
CGP EDU Academic Team
Published on: August 12, 2026
If in a triangle ABC, θ is the angle determined by cos θ
= (a – b)/c, then
A
= cos 
B
= cos 
C
= cos 
D
= cos 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, d)
cos θ = 
[by the law of sine]
= 
= 
= 
⇒ sin θ
= 
= 
⇒ 
= 
= 
= cos [(1/2) (A – B)]
and 
= 
= cos ((A + B)/2)
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