[tex]

\int_{0}^{x}e^{-t}tdt=1e^{-t}-\int_{0}^{x}-e^{-t}=0

[/MATH u=t

u'=1

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- January 21st 2011, 04:20 AMtransgalacticwhere is my mitake here ,i shouldnt get 0
[tex]

\int_{0}^{x}e^{-t}tdt=1e^{-t}-\int_{0}^{x}-e^{-t}=0

[/MATH u=t

u'=1 - January 21st 2011, 04:35 AMArchie Meade