a unifying product quotient rule proof @drpeyam
a unifying product quotient rule proof  @drpeyam
Uploaded March 2022 | Updated September 2026, 1 week ago
Deriving the product and quotient rules using the chain rule. I prove the formulas for the product and quotient of derivatives from calculus by applying the chain rule to a clever function of several variables. This is like a unified theory of everything, but for the chain rule and shows how powerful it is. I'm hoping this is useful for any undergraduate taking calculus and analysis and it gives a useful way of remembering it for math exams.

0:00 Introduction
0:28 Product Rule
2:07 Quotient Rule

Classical Quotient rule proof: youtu.be/xCcXgAdud5I
Cool Quotient rule proof: youtu.be/HBRzARgo27w

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a unifying product quotient rule proof

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