Question #288750

can the product rule be used to verify the chain rule? support your answer with example.


1
Expert's answer
2022-01-20T12:32:56-0500

Yes, for a single variableLet x, y be two given functionsConsiderf=(x+y)2.By the chain rule, we havef=2(x+y)(x+y)=2(xx+xy+yx+yy)Now, expand f to obtainf=x2+2xy+y2Thus, we havef=2xx+2(xy)+2yy=2(xx+(xy)+yy))It follows immediately that(xy)=xy+yxThus, we see that equality holds\text{Yes, for a single variable}\\ \text{Let x, y be two given functions}\\ \text{Consider} \, f=(x+y)^2. \\ \text{By the chain rule, we have}\\ f'=2(x + y)(x' + y') = 2(xx'+ xy'+ yx'+ yy')\\ \text{Now, expand f to obtain} \, f=x^2+2xy + y^2\\ \text{Thus, we have}\\ f' =2xx'+2(xy)' +2yy' = 2(xx'+(xy)'+yy'))\\ \text{It follows immediately that}\\ (xy)'=xy' + yx' \\ \text{Thus, we see that equality holds}


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