If f (x)= cos (log (e) x) then f (x) f ...

If `f (x)= cos (log _(e) x) ` then `f (x) f (y) - 1/2 [f ((y)/(x)) + f (xy)]` has the value :

A

1

B

`1/2`

C

`-2`

D

0

Text Solution

Verified by Experts

The correct Answer is:

D

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