I am reading an example on mathlab and it is simplifying a derivative using the product rule and the chain rule. I just want to know how the example simplifies without expanding.
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We have: .
Product/Chain Rule: .
Simplify a bit: . . . . . .
We have two groups: .
They have common factors: .
Factor them out! . . . m . . . m . .
Aha, now that makes sense!