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If f(x)=cos(log x), " then " f(x)*f(y)-(...

If `f(x)=cos(log x), " then " f(x)*f(y)-(1)/(2)[f((x)/(y))+f(xy)]` has the value

A

`-1`

B

`1//2`

C

`-2`

D

None of these

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The correct Answer is:
D
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