Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The difference between the greatest and least values of the function y = cos x + 
cos 2x – 
cos 3x is -
Text Solution
Verified by ExpertsThe correct answer is:
B
f(x) = – sin x – sin 2x + sin 3x
⇒ – 4 sin x sin 3/2x sin x/2 = 0
x = 0, π , 2 π , 
, 
are critical point.
X | 0 | π | 2π | 2π/3 | 4π/3 |
f(x) | 7/6 | –1/6 | 7/6 | –13/12 | –13/12 |
differential is = 7/6 – (–13/12) = 9/4
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