Published by:
CGP EDU Academic Team
Published on: August 12, 2026
cos 15 x = sin 5x if
A
x = − 
+ 
,n ∈ Ι
+ ,n ∈ Ι
B
x = 
+ 
, n ∈ Ι
+ , n ∈ Ι
C
x = 
+ 
, n ∈ Ι
+ , n ∈ Ι
D
x = − 
+ 
, n ∈ Ι
+ , n ∈ Ι
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a,b,c,d)
cos 15x = sin 5x ⇒ cos 15x = cos 
or cos 
15x = 2n π ± 
or 15x = 2n π ± 
⇒ x = 
+ 
, n ∈ Ι ,x = 
+ 
, n ∈ Ι
and x = 
– 
, n ∈ Ι and x = 
– 
, n ∈ Ι
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