Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.4 Indefinite Integrals and Substitutions, #39 · Calculus · Techniques of integration

… is … ____ … which will soon be

$\int 2 x d x / (x^{2} + 1)$ is $\int$ ____ $d u$ which will soon be $ln u$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.4 Indefinite Integrals and Substitutions, #39

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