Published by:
CGP EDU Academic Team
Published on: August 13, 2026
In Δ Δ ABC, a = 5, b = 4, and cos(A – B) = 31/32. Then
side c is
Text Solution
Verified by ExpertsThe correct answer is:
A
W e have tan 
= 
= 
.
⇒ ⇒ 
⇒ ⇒ 
cos C = 
.
Since c 2 = a 2 + b 2 – 2ab cosC, c 2 = 25 +16 – 40 × × 
= 36
⇒ ⇒ c = 6
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