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[" 53.If "f(x)=cos(log x)" ,then "],[qqu...

[" 53.If "f(x)=cos(log x)" ,then "],[qquad f(x^(2))f(y^(2))-(1)/(2)[f((x^(2))/(2))+f((x^(2))/(y^(2)))]" has the value "],[[" (a) "-2," (b) "-1],[" (c) "1/2," (d) None of these "]]

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