fun-lim

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



1) $-1$
2) $\frac{1}{2}$
3) $-2$
4) None of these
Solution: Explanation: No Explanation
Functions

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