With the method of substitution with integrals, Leibniz's notation comes in handy has it shows us usefull transformation with simple manipulation. However, I'm asking myself what is the proof behind all that? For substituion, wouldn't have to use the definition of integral and use limits?(adsbygoogle = window.adsbygoogle || []).push({});

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# Leibniz's notation and how suggestive it is

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