Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Let f k (x) = 
(sin k x + cos k x) where x ∈ R and k ≥ 1. Then f 4 (x) – f 6 (x) equals
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
f k (x) = 
(sin k x + cos k x)
f 4 – f 6 = 
= 
(1 – 2sin 2 x cos 2 x) 
(1 –3sin 2 x cos 2 x)
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