Published by:
CGP EDU Academic Team
Published on: August 12, 2026
If f(x) = cos(ln x), then f(x) f(y) - 
has the value
Text Solution
Verified by ExpertsThe correct answer is:
D
f(x) = cos(log x) f(x) f(y) − − 
= cos(log x) cos (log y) 
[cos (log x – logy) + cos (log x + log y)]
= cos (log x) cos (log y) - 
[2 cos(log x) cos (log y)] = 0
∴ ∴ is the correct alternative.
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