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

[" Hf "f(x)=cos(log x)," then "f(x)f(y)-(1)/(2)[f(x/y)+],[f(xy)]=],[[(a)-1,(b)(1)/(2)],[(c)-2,-(d)" None of these "]]

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