Question: Let I R be an open interval , let c I, let f : I{ c } R be a function and let L R

LetI Rbe anopen interval,let c I,let f: I{c} Rbe afunctionandlet LR.Using onlythedefinitionoflimits,provethat limxc f(x) = L ifandonly lim x--> [f(x)-L]=0

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