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

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

0

Text Solution

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The correct Answer is:
D
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