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Integrate of [1+x+x^2]/x(1+x^2) dx = int [x+(1+x^2)]/x(1+x^2)dx, why is that rearranging of the numerator, how come?

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  • Integrate of [1+x+x^2]/x(1+x^2) dx = int [x+(1+x^2)]/x(1+x^2)dx, why is that rearranging of the numerator, how come?


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