1/(1+x²)の積分 = Arctan(x) + c

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Integral of arctan(x)/(1+x^2) (substitution)

Proof that the integral of 1/(1+x^2) = arctanx + C

Integral of e^x(arctan x +1/(1+x^2)) || Integration by parts

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Integration by Parts :: Integral of arctan(1/x) from 1 to sqrt(2).

integral of 1/(x^2+1) but you didn't learn it this way in calculus 2

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Integral of 1/sqrt(1+x^2) (substitution + substitution)

A-level Mathematics 9709: Integration of 1/(x^2+a^2)

Integral of 1/(1+x^2)^2 (substitution)

微積分ヘルプ: Arctan の 1 次導関数 ( sqrt(1 - x^2) )

Integrate the function arccot(1-x+x^2) from 0 to 1

Integral arctan(x/a).arctan(x/b).1/x^2 from 0 to infinity