OpenStudy (loser66):

calculate \[\int {t^3e^{-t}}dt\]

OpenStudy (loser66):

|dw:1373327498574:dw|

OpenStudy (terenzreignz):

By parts seems to be the way to go here...

OpenStudy (loser66):

ok, I try to avoid it, but if there is no way to do. I will. thanks TJ

OpenStudy (terenzreignz):

I don't think there's any other way T.T

OpenStudy (loser66):

Sorry, friend, I 'm lazy when taking int 3 times for this

OpenStudy (anonymous):

@terenzreignz I agree with you, using tabular integration would be ideal. Tabular integration is basically integration by parts except for a special case where one function in the integrand can be differentiated to 0 whereas the other can be perpetually integrated.

OpenStudy (loser66):

@genius12 I know that method,(tabular), it's just a part in my differential equation, sigh!!! no choice for me

OpenStudy (terenzreignz):

Good luck :D

OpenStudy (loser66):

Thanks TJ

OpenStudy (loser66):

I have a bunch of homework, try to get a shortcut, hihi...

OpenStudy (terenzreignz):

The tabular method is a shortcut? LOL

OpenStudy (loser66):

no, I know it's not, that's why I posted the question to get other's opinion. Who knows? what if I am lucky., right?

OpenStudy (loser66):

What? I saw genius12 wrote something, why it disappears?

OpenStudy (loser66):

Thanks friends.

OpenStudy (anonymous):

|dw:1373327696068:dw| @Loser66