Sunday, August 25, 2019

Limit of limxto0+fracsinxsinsqrtx



How do I calculate this? limx0+sinxsinx


If I tried using l'Hopital's rule, it would become
limx0+cosx12xcosx

which looks the same. I can't seem to find a way to proceed from here. Maybe it has something to do with sinxx1


but I'm not sure what to do with it. Any advice?



Oh and I don't understand series expansions like Taylor's series.


Answer



By equvilency near zero sinxx we have
limx0+sinxsinx=limx0+xx=0


or
limx0+sinxsinx=limx0+sinxxxsinx.x=1×1×0=0


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