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[" If "f(x)=sin(log x)" then "],[f(xy)+f...

[" If "f(x)=sin(log x)" then "],[f(xy)+f((x)/(y))-2f(x)cos(log y)=],[[" 1) "cos(log x)," 2) "sin(log y)],[" 3) "cos(log(xy))," 4) "0]]

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