Substitution and Transformed Bounds — Cheat sheet

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Core rule

∫f(g(x))g′(x)dx=F(g(x))+Cwhen F′=f.\int f(g(x))g'(x)dx=F(g(x))+C\quad\text{when }F'=f.

Watch for

Rewrite all variable factors. For definite integrals, either transform the bounds or return to the original variable before evaluation. Track orientation and domains.