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Forum Studenti •Limite esponenziale
Pagina 1 di 1

Limite esponenziale

Inviato: giovedì 23 ottobre 2008, 16:59
da Folkloristico

Inviato: venerdì 24 ottobre 2008, 18:32
da Lethal Dosage_88
Avete fatto gli "sviluppini" o meglio ancora gli sviluppi di taylor completi??

Inviato: venerdì 24 ottobre 2008, 18:55
da Roberto_dirienzo
se fai e^log(cosx)^1/senx poi fai il limite log(cosx)^1/senx
x tende 0

e trasformi quello in (x/senx)[log (cosx-1)+1/(cosx-1)][(cosx-1)/x](x)

se fai i limiti notevoli...questo tende a 0 quindi lim e^0=1


Io invece chiedo è giusto fare taylor in questo modo:
facendo cosx= 1+o(x) visto che non esce una forma indeterminata...

Inviato: venerdì 24 ottobre 2008, 23:14
da Lethal Dosage_88
Non è corretto perchè lo "sviluppino" di cosx è
1-X^2/2+o(x)
fatto con gli sviluppi il limite (levo brutalmente gli o(x) per semplicità di scrittura..VOI NON LO FATE!!) viene:

e^log(1-x^2/2)^1/x ..mi focalizzo sull'exp.. l

log(1-x^2/2)/x ..da cui tramite "trucco contabile" ottengo..

log(1-x^2/2)*-x/2/-x^2/2

in cui la parte in grassetto è un limite notevole e il termine restante va a 0..e^0 fa 1...

Inviato: martedì 26 gennaio 2010, 20:08
da Andrea89

Inviato: mercoledì 27 gennaio 2010, 9:20
da Massimo Gobbino

Inviato: mercoledì 27 gennaio 2010, 10:13
da selly
il cos in 0 vale1, il sin in 0 vale 0...dunque rimarrebbe 1^(1/0)...però lo zero non è ne 0+ ne 0-, e nn si può dire che quello sia 1^(+00)o1^(-00)...però 1 a qualsiasi cosa sia elevato da 1, quindi a regola il lim dovrebbe dare 1...no?????

Inviato: mercoledì 27 gennaio 2010, 11:37
da Tavaguet

Inviato: mercoledì 27 gennaio 2010, 13:31
da logaritmo
Ti verrebbe :
e^[log(cos x)]/sin x per x->0.
ora studi l'esponente: è della forma [0/0] quindi puoi applicare Hopital.
Ti viene:
e^[-sinx/cosx]/cosx=
e^(-sinx/cosx)(1/cosx)=
limite notevole del seno=
e^(-sinx/x)(x/cosx)(1/cosx)=
per x->0=
e^0=1 :!: