Proof of the Product Rule from Calculus

Thanks to all of you who support me on Patreon. You da real mvps!   $1 per month helps!! :)  Patreon: patrickjmt !! Proof of the Product Rule from Calculus.  Here I show how to prove the product rule from calculus!  This is one of the reason's why we must know and use the limit definition of the derivative.  After all, that IS what a derivative is... if that makes sense! :)

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