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If f(x)=2/sqrt3 tan^-1((2x+1)/sqrt3) -l...

If `f(x)=2/sqrt3 tan^-1((2x+1)/sqrt3) -ln(x^2+x+1)+(k^2-5k+3)x+10 ` is a decreasing function for all `x in R`. then possible value of k is

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