Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If 
dx = a cos 2 2x + b cos 2x + c log | cos 2x | + λ, λ being a constant of integration then -
A
a = – 
B
b = – 
C
c = 
D
a + b + c = 0
Text Solution
Verified by ExpertsThe correct answer is:
B
dx = 
dx
= 
sin 2x dx
= 
sin 2x dx
put cos 2x = t ⇒ (– sin 2x) 2dx = dt
sin 2x dx = – 
= – 
dt
=– 
dt
= – 
dt = – 
+ λ
= – 
cos 2 2x – 
cos 2x – 
log |cos 2x| + λ
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