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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(x))" has the value "],[[" (a) "1," (b) "+1," (c) "0," (d) "3]]

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