Re: TIB: Bad Graph...

To: ti-basic@lists.ticalc.org
Subject: Re: TIB: Bad Graph...
From: Brice-Olivier Demory <brice.demory@span.ch>
Date: Fri, 11 Sep 1998 18:37:31 +0200
Delivered-To: ti-basic-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19980910195931.26184.rocketmail@send104.yahoomail.com>
Reply-To: ti-basic@lists.ticalc.org


At 10.09.1998 21:59 , The Garth Johnson wrote:

>type out
>(sin x)^2 -2sin x - 2

Thanks, It works now !

>the only way you could have gotten -.79 is if you squared x and not
>the sin of x.
>i mean, you probably typed sin x^2 which the calc evaluated at sin
>(x^2).  according to what you said below, you wanted (sin x)^2.

Yes, that's right.

>how did you get the -.82?

First I must tell you that my "english" isn't very well... Sorry

"By hand" I get -.82 by this way :

f(x)= sin^2x-2sinx-2
I want to find a root (when x=0)(is it this word ??) between
-pi/2 and pi/2.

I replace sin x by X.

I have X^2-2X-2 This is a polynomial, where DELTA=12.

I find X1 and X2 I have X1 = sinx and X2 = sinx.

I find that only one root is contained in the interval.


Thanks to all for your help ! (Jeanne9005, TgaArdvark, Tirla and
the Garth Johnson)

>From France,

Brice-Olivier Demory - http://www.skylink-astro.net/pagepers/demory
_________________________________________________________
Responsable et animateur du club d'astronomie Helios
Conseiller meteorologique C.V.V.
46d10m30s Nord - 6d09m23s Est / Haute-Savoie (France)

References:

Re: TIB: Bad Graph...

From: The Garth Johnson <gbjohnson@yahoo.com>