sIf \[f(x)=\cos (\log x)\], then \[f(x)f(y)-\frac{1}{2}[f(x/y)+f(xy)]=\] [IIT 1983; RPET 1995; MP PET 1995; Karnataka CET 1999; UPSEAT 2001]

sIf \[f(x)=\cos (\log x)\], then \[f(x)f(y)-\frac{1}{2}[f(x/y)+f(xy)]=

1.	sIf \[f(x)=\cos (\log x)\], then \[f(x)f(y)-\frac{1}{2}[f(x/y)+f(xy)]=\] [IIT 1983; RPET 1995; MP PET 1995; Karnataka CET 1999; UPSEAT 2001]
A.	\[-1\]
B.	\[\frac{1}{2}\]
C.	\[-2\]
D.	None of these
Answer» E.

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sIf \[f(x)=\cos (\log x)\], then \[f(x)f(y)-\frac{1}{2}[f(x/y)+f(xy)]=\] [IIT 1983; RPET 1995; MP PET 1995; Karnataka CET 1999; UPSEAT 2001]

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