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Forum Studenti •scritto analisi II - 19/1/2005 e 5/2/2005
Pagina 1 di 1

scritto analisi II - 19/1/2005 e 5/2/2005

Inviato: martedì 20 dicembre 2005, 20:36
da Cippa

Inviato: sabato 24 dicembre 2005, 11:20
da M4us
Per il secondo:

una primitiva della funzione è -(cos(fi))^4/4.

Per il primo: forse bisogna fare qualche considerazione su una traslazione per ricondursi all'integrale di e^-2x? non so, non ci ho ancora perso abbastanza tempo :D

Inviato: sabato 24 dicembre 2005, 20:52
da Cippa
come lo hai risolto, per parti?

ok, ora mi torna :)

Inviato: mercoledì 28 dicembre 2005, 22:39
da M4us
allora...non l'ho risolto per 'parti, l'ho risolto a occhio :lol: .
per quanto riguarda il primo, sostituisci e^(2x)=t, poi dt=2e^(2x)dx da cui ricavi dx e sostituisci di nuovo e^(2x)=t...non so se sono stata abbastanza chiara...cmq se non hai capito ti scrive tutti i passaggi. ciao

Inviato: giovedì 29 dicembre 2005, 15:46
da Cippa
ancora non mi torna:

ho 2 (l'integrale di t/(t-1) dt) giusto? e adesso devo fare un'altra sostituzione?

Inviato: giovedì 29 dicembre 2005, 21:24
da M4us
ok, ora aggiungi e sottrai al numeratore -1 e +1, poi spezzi e risolvi...