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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(xy) +f((x)/(y))]` 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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