Math Is Fun Forum

haruka-san

Member

Registered: 2006-11-08

Posts: 205

help!!!!!asap

prove that

one over square root of two pi times the integral of e raise to negative one half x squared, dx from positive infinity to negative infinity is equal to one.

---

Don’t compare your life to others. You have no idea what their journey is all about. ^_^

Pratheepa

Member

Registered: 2007-12-01

Posts: 5

Re: help!!!!!asap

e raise to the negative power of half x squared will lead to 1 as x goes to infinity because negative half of x squared will become zero, e raised to the power of zero is one....so the answer should be one over square root of two pi.

i think thats correct if i had not mistaken the question

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: help!!!!!asap

http://z8.invisionfree.com/DYK/index.php?showtopic=136

So

If you use the substitution

you should get the answer to your question.

Last edited by JaneFairfax (2007-12-01 10:51:02)