यदि f(x)=cos(logx) है, तब f(x).f(y)-(1)/...

यदि `f(x)=cos(logx)` है, तब `f(x).f(y)-(1)/(2)[f((x)/(y))+f(xy)]=`

A

`-1`

B

`(1)/(2)`

C

`-2`

D

इनमे से कोई नहीं ।

लिखित उत्तर

Verified by Experts

The correct Answer is:

D

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