Forum TI-Planet.org

Selon ce link: http://tibasicdev.wikidot.com/68k:cosh

As long as the calculator is in radian mode, cosh() can be used with complex numbers according to the rule that cosh(ix)=cos(x) and cos(ix)=cosh(x). This rule only works in radian mode, and cosh() of a complex number will return a domain error when working in degrees or gradians.

Je voudrais savoir s'il n'y a pas une fonction pour calculer cosh directement en degrees dans la n-spire cx cas vue que la HP 50G fait ça.

Euh, la question n'a pas beaucoup de sens, mais bon.
Pour calculer (où ), tape simplement cosh(x), quel que soit le mode dans lequel tu es.

Le problème soulevé par la citation que tu as donnée ne survient que lorsque l'on calcul le cosinus hyperbolique d'un nombre complexe... et ça m'étonnerait que ce soit ce que tu souhaites faire !

Bisam wrote:Euh, la question n'a pas beaucoup de sens, mais bon.
Pour calculer

$mathjax$\cosh(x)$mathjax$

(où

$mathjax$x\in\mathbb(R)$mathjax$

), tape simplement cosh(x), quel que soit le mode dans lequel tu es.

Le problème soulevé par la citation que tu as donnée ne survient que lorsque l'on calcul le cosinus hyperbolique d'un nombre complexe... et ça m'étonnerait que ce soit ce que tu souhaites faire !

Veuillez excuser mon français, c'est pas ma langue maternelle.

C'est en effet le cosinus hyperbolique d'un nombre complexe que j'avais besoin de calculer. J'avais besoin d'une réponse polar pour voir la phase et ça serait super que c'était déjà en degrees. Sauriez-vous pas comment le faire?

J'avais besoin de la réponse dans la forme 5,5(phase)32

I have the same problem, I need the calculator to be in Degrees and calculate the cosh () of a complex number, it returns me a "domain error", if someone can help ... Thank you.

Unfortunately, the problem is located on the automatic conversion from degrees to radians.
This conversion just doesn't allow complex numbers at all !

You can't find a workaround unless you just come back to radians mode.

If I had noticed that earlier, I would have told TI to modify this strange behavior ! that's a matter of a few lines of code, I think...

The point is that I use Ti nspire cx cas and the other students at 50g hp, at 50g it works that cosh and senh in degrees, so the teacher will apply the proof based on that everyone can do the calculation, and I can not find one Alternative in time, 2 days left for the test .... I'm desperate ....
What I need to do is simple but it is the beginning of everything in the problems to find tension and current with hyperbolic cosine.
The Matter is Transmission Lines, if anyone knows any alternative to this I thank you very much.
I have tried to do all calculations in RAD and then convert to degrees, but the results do not beat after converting ...

In fact there are 2 conversions : one from degrees to radians before applying the "cosh", and one from radians to degrees after it.

You may try something like that :

Code: Select all

ch(x):=cosh(x°)►Deg

and use it in radian mode.
It should work... but it's only a workaround for THAT function.