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ਕਦਮ ਦਰ ਕਦਮ

1. \int \frac{1}{x^{2} + 1}\, dx

   Find an antiderivative.

2. \int \frac{1}{x^{2} + 1}\, dx = \operatorname{atan}{\left(x \right)}

   Recognise an inverse-trig / inverse-hyperbolic form.

3. F(x) = \operatorname{atan}{\left(x \right)} + C

   Add the constant of integration.