Integral of 1/(x^2+1) by using complex number

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Integral of 1/(x^2+1) by using complex number

Reduction formula in Calculus: https://www.youtube.com/playlist?list=PLg9w7tItBlZubmhgkHoHvje1uOASnkcke
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Interesting partial fraction Integral: https://www.youtube.com/watch?v=O9sV_qYsuNM&list=PLg9w7tItBlZvVKf27gAjKCSLoZByobPEU

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0xab3acdec0919be9d429baf2190de2e2a4a384c7e

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