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From: Danny Gerst on 7 May 2008 15:34
Hi,

I am really confused. I own a HP48g for two month, but it was not
possible for me to run a symbolic differenation.

The example in the short manual for example:

f(x)=5*x^2-6/x

I started the function differentiate, entered the term 5*x^2-6/x in the
field EXPR:, choose X in the field VAR and selected Symbolic in the
field RESULT. After hitting OK I got an numeric value on the stack:
65.1420118343.

This happens with every function I try to differentiate. Only the number
afterward on the stack changed. I never got the symbolic solution.

Anyone an idea, what I did wrong or why the 48g behaves this way?


Thanks in advanced,

Danny
From: Tom Lake on 7 May 2008 15:46

"Danny Gerst" <dannygerst(a)gmx.de> wrote in message
news:68eehcF2s2n5sU1(a)mid.uni-berlin.de...
> Hi,
>
> I am really confused. I own a HP48g for two month, but it was not possible for me
> to run a symbolic differenation.
>
> The example in the short manual for example:
>
> f(x)=5*x^2-6/x
>
> I started the function differentiate, entered the term 5*x^2-6/x in the field
> EXPR:, choose X in the field VAR and selected Symbolic in the field RESULT. After
> hitting OK I got an numeric value on the stack: 65.1420118343.
>
> This happens with every function I try to differentiate. Only the number afterward
> on the stack changed. I never got the symbolic solution.
>
> Anyone an idea, what I did wrong or why the 48g behaves this way?

Does the variable x have a value? If so the calculator may be using that rather
then the symbol 'x'.

Tom Lake

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