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

[" If "f(x)=cos(log_(e)x)," then "f(x)*f(y)-(1)/(2)[f(xy)+],[f(x/y)]" is equal to "],[[" (a) "0," (b) "(1)/(2)f(x)f(y)],[" (c) "f(x+y)," (d) none of these "]]

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