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Taylor, Maclaurin, & Power series challenge

Use the fact that  11+x2 dx=arctanx+C \displaystyle~\int{\frac{1}{1+{{x}^{2}}}\text{ }dx=\arctan x+C}~ to determine which of the following is a power series representation of  f(x)=arctanx\displaystyle~ f\left( x \right)=\arctan x\,.