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Old 11-08-2006, 03:40 AM  
ladida
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Join Date: Nov 2005
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Quote:
Originally Posted by skinnay View Post
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
Your task is http://www.sosmath.com/tables/integr...7/integ27.html under 2.

Other then that, your error is dv=e^(r/2)dr => v=e^(r/2)
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