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Forum Studenti •limite che sembra facile ma non lo è
Pagina 1 di 1

limite che sembra facile ma non lo è

Inviato: venerdì 3 settembre 2010, 15:57
da nick3000
Utilizzando i limiti notevoli calcolare il seguente limite (quindi non bisogna usare ne la formula di taylor ne il teorema De L'Hopital

lim ( (x - log(x+1))/(arcsin x)^2)
x->0


Per calcolare questo limite innanzi tutto mi sono liberato dell'arcsin x moltiplicando e dividendo il denominatore per x^2 così ottengo

lim ( (x - log(x+1))/(x)^2)
x->0

Mettendo in evidenza x al numeratore ottengo

lim (1 - log(x+1)/x)/x =
x->0
lim ((1/x) - log(x+1)/x^2)
x->0

Da qui in poi ho dei dubbi su come procedere, c'è qualcuno che saprebbe come fare?

Inviato: domenica 5 settembre 2010, 19:10
da Andrea 2
Non ho capito bene il tuo procedimento e frequento ancora il liceo quindi non so quanto posso esserti utile, però innanzitutto la cosa che appare più evidente è che stai facendo il limite metà per volta. Quando dici che "mi sono liberato dell'arcsin x" stai dicendo che sostituisci il limite notevole che ha l'arcsen x con 1, e quindi il limite fatto metà per volta magari non riesce...in ogni caso procedendo io arrivo ad una forma 0 per +infinito che è ancora una forma indeterminata...puoi provare a usare gli sviluppini tanto per vedere a cosa si arriva, così ottieni che il limite è o(x)/[x+o(x)], da cui mettendo in evidenza sopra e sotto la x ottieni che il limite viene zero, per cui magari puoi provare a vedere se riesci a concludere qualcosa a posteriori basandoti sul risultato...di più per ora non credo di potere fare :wink: !

Re: limite che sembra facile ma non lo è

Inviato: martedì 7 settembre 2010, 15:38
da Massimo Gobbino

Inviato: mercoledì 8 settembre 2010, 11:30
da nick3000