Published by:
CGP EDU Academic Team
Published on: August 11, 2026
If 
; 
, then 
is equal to
A
B
0
C
D
–1
Text Solution
Verified by ExpertsThe correct answer is:
A
Sol. AM ≥ GM
so , AM = GM ⇒ sin 4 α = 4cos 4 β = 1
sin 4 α = 1 ⇒ α = 
cos β = 
⇒ β = 
hence vr% –2sin α sin β = –2 × 1 × 
= – 
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