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[" (1) I "((5))/(4)" if "f(x)=cos(log(8)...

[" (1) I "((5))/(4)" if "f(x)=cos(log_(8)x)" ,then "f((1)/(x))f((1)/(y))-(1)/(2){f(x)=f((x)/(y))}" is equal to "],[[" (in) "((pi)/(4))," (年) "(1)/(2)]]

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