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Forum Studenti •LIMITI 9 PRIMA COLONNA SECONDO
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LIMITI 9 PRIMA COLONNA SECONDO

Inviato: domenica 23 gennaio 2011, 14:25
da Andrea.Dieni
(2cosx-2+x^2)/x^5....
come si fa a dedurre che non esiste?? :?

Inviato: domenica 23 gennaio 2011, 15:19
da dakron9
nel modo rapido credo che sia: cosx è pari, x^5 è dispari...

sostituire 0+ e 0- per credere...
anche se pure quello con x^3 ha cos pari e x^3 dispari, ma nello sviluppo la x è al numeratore..

è tutta questione di sviluppi..

basta che sviluppi con ordine 5 e alla fine ti rimane un termine tipo 1/(12x) che non ha limite per x->0, ma solo per x->0+ oppure x->0-

più o meno hai capito il ragionamento?

Inviato: domenica 23 gennaio 2011, 18:54
da Andrea.Dieni
INFATTI ho fatto losviluppino e mi risulta appunto 1/12x, quindi questo valore tende per valori diversi a 0+ e a 0-?? se è cosi l'avevo risolto fin da prima senza rendermene conto xD

Inviato: domenica 23 gennaio 2011, 22:28
da dakron9
a volte sono proprio le cose più semplici e basilari che causano difficoltà... :) :)