Saturday, April 30, 2016

limits - Is L'Hopital for limlimitsxto0fracsin(x)x circular?

I was considering using L'Hopital for limx0sin(x)x, but I was told that this is circular, because we use this limit to show ddxsin(x)=cos(x).



Do we have to use this limit to find the derivative of sin(x), or is there a legitimate counter-argument here?

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