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log((x*x+9)/(x*x))*sqrt((3*x-x*x*atan(3/x))/atan(3/x))/(-2*x*atan(3/x)+6)
log((x*x+9)/(x*x))*sqrt((3*x-x*x*atan(3/x))/atan(3/x))/(-2*x*atan(3/x)+6)
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