my tnspire give me a wrong solution

LeoR87 22 Aug 2014 09:03

Hi guys!

I have a this problem: my nspire give me the right result about a function (I know that because I've read it on my text)…but when I ask at my nspire to replace a value in this function, I've a wrong solution…why?

How can I add images from my desktop for a better comprehension?

```
Define piastre1()=
Prgm
:Define w(t)=∫(((1)/(t))*∫(t*∫(((carico(t))/(d)),t),t),t)+∫(((1)/(t))*∫(c1*t,t),t)+∫(((c2)/(t)),t)+c3
:Define α(t)=−(w(t),t)
:Disp "w(t) =",w(t)
:Disp "α(t) =",α(t)
:EndPrgm
```

and then

```
carico(t):=((q*t)/(2))
piastre1()
0→c2
solve(α(a)=0,c1)
```

I copy this result and define the constant

but if you set up t=a you have a wrong solution

```
α(t)
α(a)
```