The Product Rule

The derivative of a product requires the product rule—not simply multiplying individual derivatives—and the formula is f'(x)·g(x) + f(x)·g'(x).


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Feynman technique

Learn with the Feynman Technique

Explain each idea in your own words in handwriting, then upload a photo for AI critique. Two attempts per question — there's no "right" answer, only depth of understanding.