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skinnay · 11-07-2006, 11:58 PM

im trying to integrate

S re^(r/2) dr

so i go

[u=r dv=e^(r/2)dr]
[du=dr v=e^(r/2) ]

S re^(r/2) dr = re^(r/2) - S e^(r/2)dr
S re^(r/2) dr = re^(r/2) - e^(r/2)

however the answer i should get is

2(r-2)e^(r/2)

i dont get it

11-07-2006, 11:58 PM
skinnay Confirmed User Join Date: Apr 2004 Location: NEW YORK CITY Posts: 2,274	i need some math help im trying to integrate S re^(r/2) dr so i go [u=r dv=e^(r/2)dr] [du=dr v=e^(r/2) ] S re^(r/2) dr = re^(r/2) - S e^(r/2)dr S re^(r/2) dr = re^(r/2) - e^(r/2) however the answer i should get is 2(r-2)e^(r/2) i dont get it __________________ Make Real Green with ORGANIC SEO \| Blog post exchange \| Non-index page trades \| A-B C-D Trades [icq: 194-215-962] [mail: [email protected]]