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[" 3.If "f(x)=cos(log x)," then "f(x)f(y...

[" 3.If "f(x)=cos(log x)," then "f(x)f(y)-(1)/(2)[f(x/y)+f(xy)]" is equal to - "],[[" (A) "-1," (B) "1/2," (C) "-2]]

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