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Please help me with this math problem :) If f(g(x)) = g(f(x)) = x, and g(x) = 2 + ln(x+1), find f(4).? What Density range of Thermoplastics? Discuss briefly the recruitment process? Find the values of p for which the series is convergent. Sigma infinite on top and n=1 on bottom. n(1+n^2)^p? How can we differentiate between alcohol and ether by chemical tests?