### Integration by Substitution

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Integration by Substitution This method is also called the u-substitution or the reverse of chain rule of derivation. The chain rule except being useful in derivation is also in integration: If we have two functions $displaystyle f(x)$ and $displaystyle g(x)$ then the derivative of their composite function is:$displaystyle (fcirc g{)}'(x)={f}'(g(x)){g}'(x)$. How it helps on integration […]