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From: Gandalf on 23 Jan 2006 06:17
Hi,
i have this problem...
I have to solve an integral between -inf and +inf but the calc doesn't
solv it...
it gives me some sum of naturals logaritms.
How can i solve it?

the integral i have to solv is this:

integral form -inf to +inf of (10^(-12))/(1+(2*?*5*(10^(-7))*x)^2) in dx

u can see it in graphical form here:
http://www.geocities.com/bagbyte/integral.jpg

please help me!

thank u
From: Steen Schmidt on 23 Jan 2006 07:27
Gandalf wrote:

> the integral i have to solv is this:
>
> integral form -inf to +inf of (10^(-12))/(1+(2*?*5*(10^(-7))*x)^2)
> in dx

When I do 'S(-inf,+inf,10^-12/(1+(2*pi*5*10^-7*X)^2),X)', where S is
the integration symbol, my HP49G+ returns '1/1000000'. It's important
to do this in exact mode, or else you'll get numeric overflow.

I'll award an extra point for finding an integral that the HP49G+ is
faster than the TI89 at calculating ;-)

Regards
Steen
From: Gandalf on 23 Jan 2006 08:03

'S(-inf,+inf,10^-12/(1+(2*pi*5*10^-7*X)^2),X)'

i try to write it but it returns: "Undefined Name"
From: Gandalf on 23 Jan 2006 08:12
now i tryed again..but it seems to be blocked...
now what i can do to un-block it?
From: Steen Schmidt on 23 Jan 2006 11:57
Gandalf wrote:

>
> 'S(-inf,+inf,10^-12/(1+(2*pi*5*10^-7*X)^2),X)'
>
> i try to write it but it returns: "Undefined Name"

What are your flag settings (use RCLF to recall them)? Do you have
anything stored in X?

Regards
Steen
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