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- Find a power series representaton for f(x) = 1/(5+2x)a) Find the values of x for which the series x' converges. 5n Answer: (b) Find the sum of the series for those values of x . Sum = (your answer should be a function of x)Represent this function by a power series. Then find the interval of convergence. f(x)= x/(9+x^2)