CripplerCrossface

Senior member
Jun 24, 2002
464
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0
CAn someone do the integral of e^x^2? I dont think its possible so Im not going to fudge with it. If it can be done holla at me.
 

CripplerCrossface

Senior member
Jun 24, 2002
464
0
0
r u sure. i dont think u can just bring it down like that. now if the problem WAS e^(2x) it would be easy but e^(2x) /= e^(X^2). Unless you are using some kinda formula I dont know aboot.
 

klah

Diamond Member
Aug 13, 2002
7,070
1
0
Maple gives this:

1/2*Pi^(1/2)/(-ln(e))^(1/2)*erf(sqrt(-ln(e))*x)
 

bleckywelcky

Senior member
Sep 16, 2002
276
0
0
Originally posted by: xyion
that equals e^(2x), and that can be integrated. Its a property of e.

No, No, No!

That is completely, absolutely, 100% invalid. Basic algebra rules.

e^x^2 != e^2x

What we do not have:
---------------------------

(e^x)^2 = (e^x) * (e^x)

Bases are the same, so add the exponents,

x + x = 2x

(e^x) * (e^x) = e^(x + x) = e^2x

What we do have:
----------------------

e^(x^2) = e^(x * x)

e^(x * x) != e^(x + x)

You can not easily integrate the e^(x^2) function because you have a power, then a chain, then a power on this exponent function. Your teacher/professor will usually never ask you to do an indefinite evaluation on that function. However, they may give you that function and ask you to do a definite evaluation. In which case, you should use whatever program you have loaded onto your calculator or computer to evaluate the indefinite integral with a number of divisions, N, that will meet your error requirements (that N value would be calculated seperately).

-
 

CripplerCrossface

Senior member
Jun 24, 2002
464
0
0
Originally posted by: bleckywelcky
Originally posted by: xyion
that equals e^(2x), and that can be integrated. Its a property of e.

No, No, No!

That is completely, absolutely, 100% invalid. Basic algebra rules.

e^x^2 != e^2x

What we do not have:
---------------------------

(e^x)^2 = (e^x) * (e^x)

Bases are the same, so add the exponents,

x + x = 2x

(e^x) * (e^x) = e^(x + x) = e^2x

What we do have:
----------------------

e^(x^2) = e^(x * x)

e^(x * x) != e^(x + x)

You can not easily integrate the e^(x^2) function because you have a power, then a chain, then a power on this exponent function. Your teacher/professor will usually never ask you to do an indefinite evaluation on that function. However, they may give you that function and ask you to do a definite evaluation. In which case, you should use whatever program you have loaded onto your calculator or computer to evaluate the indefinite integral with a number of divisions, N, that will meet your error requirements (that N value would be calculated seperately).

-
Dag u aint have to do it like that. u sound like a bloody prof. i bet you would have typed in red if u could.
 

bleckywelcky

Senior member
Sep 16, 2002
276
0
0
Originally posted by: CripplerCrossface
Dag u aint have to do it like that. u sound like a bloody prof. i bet you would have typed in red if u could.

lol! Sorry, that guy just sounded like he was really sure that you could do something like that. I guess I was apalled? Dunno, heh. Just loved (and still love) my math classes I've had throughout the various years, so I hold the subject very near and dear to my heart :) :p :D Wanted to make sure no one else would be tripped up by that. And yeh, I woulda put the Nos in red if I could have :p

-
 

CripplerCrossface

Senior member
Jun 24, 2002
464
0
0
Originally posted by: bleckywelcky
Originally posted by: CripplerCrossface
Dag u aint have to do it like that. u sound like a bloody prof. i bet you would have typed in red if u could.

lol! Sorry, that guy just sounded like he was really sure that you could do something like that. I guess I was apalled? Dunno, heh. Just loved (and still love) my math classes I've had throughout the various years, so I hold the subject very near and dear to my heart :) :p :D Wanted to make sure no one else would be tripped up by that. And yeh, I woulda put the Nos in red if I could have :p

-

lol. tru. i wish i had the same desire towards math.
 

Buzzman151

Golden Member
Apr 17, 2001
1,455
0
0
Beer + Beer - (2Beer + lunch) +/- hoes = fun

No No No No NO!

It's... Beer + Beer - (2Beer + lunch) +hoes - (old hoez)^(1/2) + (big boobies) = fun for the whole family :D