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

[" If "f(x)=cos(log x)," then "f(x)f(y)-(1)/(2)[f((x)/(y))+f(xy)]=],[[" (a) "(1)/(2)," (b) "2," (c) "0]]

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