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Integrate 1/(x^2+1 )?
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Integrate 1/(x^2+1 )?
Integration of 1/(x^2+1)

To integrate 1/(x^2+1), we can use the substitution method. Let u = x^2+1, then du/dx = 2x and dx = du/2x.

Substituting u and dx in the integral, we get:

∫1/(x^2+1) dx = ∫1/u * (du/2x) = (1/2) ∫1/u du

Now, integrating 1/u with respect to u, we get:

(1/2) ln|u| + C

Substituting back the value of u, we get:

(1/2) ln|x^2+1| + C

Therefore, the final answer to the integral of 1/(x^2+1) is:

∫1/(x^2+1) dx = (1/2) ln|x^2+1| + C
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