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If f(x)=cos(logx), then f(x)f(y)-1/2[f(x...

If `f(x)=cos(logx)`, then `f(x)f(y)-1/2[f(x/y)+f(xy)]`=

A

`-1`

B

`1//2`

C

`-2`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
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