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→[[Integral#Multiple integrals|Multiple integrals]]: clean up & uniformity
When integrating a derivative formed according to the chain rule, one first needs to identify g'(x) and separate it from f'(g(x)). To avoid confusion, it can often be helpful here to substitute a single variable (traditionally "u" or "μ") for g(x) and <math>\frac{du}{dx}</math> for g'(x).
When integrating a derivative formed according to the chain rule, one first needs to identify g'(x) and separate it from f'(g(x)). To avoid confusion, it can often be helpful here to substitute a single variable (traditionally "u" or "μ") for g(x) and <math>\frac{du}{dx}</math> for g'(x).
===[[Integral#Multiple_integrals|Multiple integrals]]===
===[[Integral#Multiple integrals|Multiple integrals]]===
[[Image:Parabola.png|right|thumb|pxl=200|Change of variables can help one integrate over irregular regions, such as the areas under and between these parabolas]]
[[Image:Parabola.png|right|thumb|pxl=200|Change of variables can help one integrate over irregular regions, such as the areas under and between these parabolas]]