Question: Use the power series for (1 + x 2 ) 1 and differentiation to prove that for |x| 2x (x + 1) = (-1)-1(2n)x21-1 n=1

Use the power series for (1 + x2)−1 and differentiation to prove that for |x|

2x (x + 1) = (-1)"-1(2n)x21-1 n=1

2x (x + 1) = (-1)"-1(2n)x21-1 n=1

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