- #1
stunner5000pt
- 1,461
- 2
[tex] \frac{1}{\sqrt{2 \pi \sigma^2}} \int_{-\infty}^{\infty} x^2 e^{\frac{-x^2}{2 \sigma^2}} dx [/tex]
I think just slving this would be fine too
[tex] \int_{-\infty}^{\infty} x^2 e^{-x^2} dx [/tex]
what is the trick to solving this?/
Cnat integrate by parts because that would yeild Erf function which i have no been taught
I was told that there was some trick to differentiate both sides by sigma... but I am not relly sure...?
I think just slving this would be fine too
[tex] \int_{-\infty}^{\infty} x^2 e^{-x^2} dx [/tex]
what is the trick to solving this?/
Cnat integrate by parts because that would yeild Erf function which i have no been taught
I was told that there was some trick to differentiate both sides by sigma... but I am not relly sure...?