anonymous
  • anonymous
integrate (t^-2)(e^t)dt
Mathematics
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anonymous
  • anonymous
integrate (t^-2)(e^t)dt
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
use integration by parts.
anonymous
  • anonymous
how exactly?
anonymous
  • anonymous
int (u *dv) = uv- int (v * du) in this case, you let u=t^-2 and v= e^t

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anonymous
  • anonymous
I tried that. doesn't work because du will become -2t^-3, which doesn't help.
anonymous
  • anonymous
so try dv=t^-2 and u=e^t. u may need to do integration by parts twice.
anonymous
  • anonymous
i tried that too. eventually the integral becomes lnt*e^tdt. How do you integrate that?
anonymous
  • anonymous
i don't think you can integrate this and get a transdencental function
anonymous
  • anonymous
thanks everyone.

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