Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Find the extreme values of cos x cos 
cos 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(– 
, 
)
Let y = cosx .cos 
y = 
⇒ y = 
y = 
⇒ y = 
[cos 3x + cos x – cosx]
y = 
cos 3x –1 ≤ cos 3x ≤ 1
ymin = – 
and ymax = 
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