Bug for TI 89 Titanum!

il matematico

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Sep 17, 2005, 12:36:10 PM9/17/05

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I think that TI 89 Titanum has a bug vs TI 89 because Titanum
doesn't solve zeros(tg(2x)+2tg(x),x) but the TI 89 solves (in partial)
this operation. Why?

Matteo Puzzle
Italy
http://it.groups.yahoo.com/group/softwarestrumentitecnologici/
http://www.matematicamente.it/giochi/La_matematica_degli_indovinelli_3.0.pdf

Bhuvanesh

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Sep 17, 2005, 2:17:02 PM9/17/05

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il matematico wrote:
> I think that TI 89 Titanum has a bug vs TI 89 because Titanum
> doesn't solve zeros(tg(2x)+2tg(x),x) but the TI 89 solves (in partial)
> this operation. Why?

What is the definition of tg(x)?

Bhuvanesh.

Gerson W. Barbosa

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Sep 17, 2005, 3:33:08 PM9/17/05

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Hello Bhuvanesh,

'tg' is short for 'tangent' here in Brazil and, I think, in Italy too.

Regards,

Gerson.

il matematico

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Sep 17, 2005, 4:36:22 PM9/17/05

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Yes!
zeros(tan(2x)+2tan(x),x)

il matematico

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Sep 17, 2005, 4:37:00 PM9/17/05

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Yes!
zeros(tan(2x)+2tan(x),x)

Bhuvanesh

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Sep 17, 2005, 5:48:53 PM9/17/05

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Hi,

I can't reproduce this. I get 19 solutions with AMS 2.09 and AMS 3.10.
Which AMS version are you using?

Bhuvanesh.

il matematico

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Sep 17, 2005, 6:37:05 PM9/17/05

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I use TI 89 and I haven't TI 89 Titanium (I can't try to compare TI 89
Titanium with old TI 89), but some people noted this difference between
TI 89 and TI 89 Titanium for this operation:
zeros(tExpand(tan(2x)+2tan(x)),x)
They signalled this problem in inofficial italian forum for calculator:
http://it.groups.yahoo.com/group/softwarestrumentitecnologici/message/1308
I think that this people, in their TI 89 Titanium, there is the last
AMS (3.10):
http://it.groups.yahoo.com/group/softwarestrumentitecnologici/message/1322
Thank you Great Bhuvanesh!

il matematico

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Sep 17, 2005, 6:42:28 PM9/17/05

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Excuse me, the operation is: zeros(tan(2x)+2tan(x),x) not
zeros(tExpand(tan(2x)+2tan(x)),x)

crawla...@lycos.com

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Sep 17, 2005, 6:48:29 PM9/17/05

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If you use solve(tan(2*x)+2*tan(x)=0,x) it gives the solution x = 0
with a warning that other solutions may exist.

If you tExpand and then divide by sin(x), and then solve that, you'll
get all the solutions (except those that correspond to sin(x) = 0).

But, yeah, the zeroes function gives an empty set for me.

I tried it on a TI89 (not Titanium) emulator, and it also gave me an
empty set when in exact mode, though. On auto mode, it gave a set of
several numerical possibilities.

If it's an issue of an outdated OS, maybe I should upgrade, though I
can still get the answer as demonstrated above. (I'm not sure what OS
I have, but I've never upgraded it).

Message has been deleted

Bob Wang

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Sep 17, 2005, 7:30:08 PM9/17/05

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Just like Bhuvanesh, I get 19 solutions for AMS 2.09 on a TI-89, and AMS
3.10 on a Voyage 200

Bob
P.S. Shouldn't this be moved to the TI-89 Forum ;-) Kevin's fluent in
Italian

il matematico

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Sep 18, 2005, 4:58:41 AM9/18/05

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> hello,
> I use TI-89 titanium with O.S. and hardware versione 3.0;
> for zeros(tg(2x)+2tg(x),x) give me x=-54.7356 and x= 0 with written
> "Warning: more solution may exist".

But, it doesn't get a result "in exact mode" for this operation:
zeros(tan(2x)+2tan(x),x)

Bhuvanesh

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Sep 19, 2005, 11:41:50 PM9/19/05

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Right, but was there really a version that gave the exact result (i.e.
the parametrized family of solutions) without applying tExpand()?

Bhuvanesh.

L.A.

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Nov 1, 2005, 12:52:58 PM11/1/05

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il matematico , Posted to the comp.sys.hp48 group , the following :

Oh gosh I'm imagining now...

If this froup starts turning into a forum for the TI-89s,

won't the HP brass try to pick-up the ball in panic ?

If there is no money for creativity and fine tuning work,

perhaps 'Fear and Shame' will drive the corporate machine our way.

You'll LOVE your TIt (TI titanium,lol).

L.A.

A.L.

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Nov 2, 2005, 10:14:14 AM11/2/05

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On Tue, 01 Nov 2005 17:52:58 GMT, "L.A." <l...@la.la> wrote:

>il matematico , Posted to the comp.sys.hp48 group , the following :
>
>> I think that TI 89 Titanum has a bug vs TI 89 because Titanum
>> doesn't solve zeros(tg(2x)+2tg(x),x) but the TI 89 solves (in
>> partial) this operation. Why?
>>
>> Matteo Puzzle
>> Italy
>> http://it.groups.yahoo.com/group/softwarestrumentitecnologici/
>> http://www.matematicamente.it/giochi/La_matematica_degli_indovinell
>> i_3.0.pdf
>>
>
>Oh gosh I'm imagining now...
>
>If this froup starts turning into a forum for the TI-89s,
>
>won't the HP brass try to pick-up the ball in panic ?

They don't care. Most likely, calculator division doesn't make any
money and is in red. Probably they are thinking how to shut this
division down not making too much harm to HP reputation.

A.L.

timwe...@gmail.com

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Nov 2, 2005, 10:35:03 AM11/2/05

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Actually for its size, they are quite profitable. Sure it isn't a huge
amount compared to the company as a whole, but they do contribute more
than a few pennies. . .

I don't have any figures, that is just what we've been told at past HHC
events. If I remember correctly, ACO was doing quite well before. The
closure before was just politics as "satan's concubine" was trying to
become a Dell clone.

TW

Cyrille de Brébisson

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Nov 2, 2005, 1:45:53 PM11/2/05

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hello,

<timwe...@gmail.com> wrote in message
news:1130945703.6...@g47g2000cwa.googlegroups.com...

Are you talking about "sho who must not be named"?

regards, cyrille

A.L.

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Nov 2, 2005, 1:12:40 PM11/2/05

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On 2 Nov 2005 07:35:03 -0800, timwe...@gmail.com wrote:

>Actually for its size, they are quite profitable. Sure it isn't a huge
>amount compared to the company as a whole, but they do contribute more
>than a few pennies. . .

As I recall from few month ago, the only profitable operation was
manufacturing ink for ink jet printers and toner cartridges for laser
printers...

A.L.