Another Integration Question involving Exponential Functions (1 Viewer)

[SureBluff]

Help on Integration Question involving Exponential Functions

Hi, this is my first thread on this site. Great site

I'm currently in year 11 and this question has been bugging me for hours, I got so confused.

Find the primitive function of:

(e^(1/x))/(x^2)

 

[Trev]

You know when you differentiate 1/x you get -1/(x²); since the integral isn't a negative then you need to put a negative in front of it so the answer is -e^1/x + C.
If you didn't understand that, try using substitution u=1/x.

 

[SureBluff]

thank you.

damn, I got it mixed up with d/dx(lnX) = 1/x. I thought it was the other way around.

 

[Kd14]

DONT ever mix them up. Happened to me and look at me now, no hair..

jks.

Yeh, just try to keep that in mind. =D