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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

I got one question, I was looking at a Swedish math video for draw graph and for some reason he did take derivate and did equal to zero and did calculate the roots and then he did take limit of the derivate function to the roots and it's there I did not understand, what does that mean? example we get the root 1 then we take the \(\displaystyle \lim_{x->1}f'(x)\) what does that mean?

Regards,

\(\displaystyle |\pi\rangle\)