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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

0

B

`(1)/(2)f(x)f(y)`

C

`f(x+y)`

D

`f(x-y)`

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The correct Answer is:
A
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