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

[" If "f(x)=cos(log_(e)x)," then "f(x)f(y)-(1)/(2)[f((x)/(y))+f(xy)]" has value "],[[" (a) "-1," (b) "1/2," (c) "-2," (d) None of these "]]

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