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 Arp
roving mycophagist
Registered: 04/20/98
Posts: 2,191
Loc: in a van by the river
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 arcsin and ti-89 titanium 
#8195408 - 03/26/08 06:14 AM (16 years, 24 days ago) |
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Hey dudes.
Taking a course in physics, and right now it's about refraction.
I need to be able to use arcsin.
For instance, arcsin 0,767 is supposed to return 50 (degree) according to the book.
Sin^-1 is supposedly synonymous to arcsin, but when I enter sin^-1(0,767) it returns 0.874153, and not 50 
What am i doing wrong? 
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Arp
roving mycophagist
Registered: 04/20/98
Posts: 2,191
Loc: in a van by the river
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 Re: arcsin and ti-89 titanium [Re: Arp]
#8195423 - 03/26/08 06:19 AM (16 years, 24 days ago) |
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hmm. I think I have to turn 0.874153 into degrees. Now how do I turn these values into that? 
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 elaspeinreason
psychonaut
Registered: 07/31/05
Posts: 1,029
Loc: fairfax virginia
Last seen: 11 years, 4 months
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Re: arcsin and ti-89 titanium [Re: Arp]
#8195425 - 03/26/08 06:21 AM (16 years, 24 days ago) |
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the sad part is all of what you said seems so foreign
yet it shouldnt.
wish i could help ya ?
--------------------
Reality is merely an illusion, albeit a very persistent one
Diploid said:
What's with proclaiming freedom by abridging freedom? That makes no sense.
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Arp
roving mycophagist
Registered: 04/20/98
Posts: 2,191
Loc: in a van by the river
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When I enter sin(50degree), 0.766044 is returned.
Can I calculate that value back to 50?
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Arp
roving mycophagist
Registered: 04/20/98
Posts: 2,191
Loc: in a van by the river
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Re: arcsin and ti-89 titanium [Re: Arp]
#8195493 - 03/26/08 06:53 AM (16 years, 24 days ago) |
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duh I think I solved it. I entered the mode menu and changed angle to degree. Now sin^-1(0,766044) will return 50 
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Annom
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Registered: 12/22/02
Posts: 6,367
Loc: Europe
Last seen: 10 months, 25 days
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Re: arcsin and ti-89 titanium [Re: Arp]
#8195514 - 03/26/08 07:05 AM (16 years, 24 days ago) |
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Yes, that does the trick.
The relation between degree and radians is pretty simple:
2*pi rad = 360 deg (one full circle) -> 1 rad = 180/pi deg and 1 deg = pi/180 rad.
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Legend9123
Registered: 09/24/06
Posts: 2,590
Last seen: 10 months, 29 days
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Re: arcsin and ti-89 titanium [Re: Annom]
#8195554 - 03/26/08 07:32 AM (16 years, 24 days ago) |
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What Annom said. The TI-89 Titaniums are amazing calculators too. 
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Those who would give up a little freedom to get a little security shall soon have neither.
-Benjamin Franklin
Edited by Legend9123 (03/26/08 08:05 AM)
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 6 days
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Re: arcsin and ti-89 titanium [Re: Legend9123]
#8195586 - 03/26/08 07:44 AM (16 years, 24 days ago) |
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> The TI-89 Titaniums are amazing calculators too.
Do they use reverse polish notation? My HP 48SX is about to die, after eighteen years of use, so I will be looking for a replacement.
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Just another spore in the wind.
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Legend9123
Registered: 09/24/06
Posts: 2,590
Last seen: 10 months, 29 days
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Re: arcsin and ti-89 titanium [Re: Seuss]
#8195616 - 03/26/08 08:00 AM (16 years, 24 days ago) |
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You can use RPN on the 89 and 92 with a third party interface. It doesn't natively support RPN, though. http://www.paxm.org/symbulator/download/rpn.html
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Those who would give up a little freedom to get a little security shall soon have neither.
-Benjamin Franklin
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Annom
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Registered: 12/22/02
Posts: 6,367
Loc: Europe
Last seen: 10 months, 25 days
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Re: arcsin and ti-89 titanium [Re: Seuss]
#8195621 - 03/26/08 08:02 AM (16 years, 24 days ago) |
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I bought a TI-89 last week. It doesn't use RPN, but I'm sure there are RPN interfaces to download for the TI-89.
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Asante
Omnicyclion prophet
Registered: 02/06/02
Posts: 87,330
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Re: arcsin and ti-89 titanium [Re: Arp]
#8195721 - 03/26/08 08:59 AM (16 years, 24 days ago) |
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All I could think of was that Ti-58 is the highest Titanium isotope 
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Omnicyclion.org
higher knowledge starts here
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 6 days
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Re: arcsin and ti-89 titanium [Re: Annom]
#8195725 - 03/26/08 09:02 AM (16 years, 24 days ago) |
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> It doesn't use RPN, but I'm sure there are RPN interfaces to download for the TI-89.
Bleh, I will pass then. I don't see how people use non-RPN calculators; my brain just doesn't work that way.
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Just another spore in the wind.
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Annom
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Registered: 12/22/02
Posts: 6,367
Loc: Europe
Last seen: 10 months, 25 days
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Re: arcsin and ti-89 titanium [Re: Seuss]
#8195767 - 03/26/08 09:23 AM (16 years, 24 days ago) |
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Do you also use RPN on paper, when doing symbolic calculations?
What are the important advantages?
I just type everything on one line, exactly as I have it on paper. Then the TI-89 gives a nice overview in "writing style" of the whole computation and the answer. It is easy to spot errors this way because you can compare what is on the screen with what you have on paper.
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DieCommie
Registered: 12/11/03
Posts: 29,258
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Re: arcsin and ti-89 titanium [Re: Annom]
#8195857 - 03/26/08 10:04 AM (16 years, 24 days ago) |
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I have the HP-50G and 35s, each of those uses RPN 
Do you also use RPN on paper, when doing symbolic calculations?
I think RPN is more closely related to how you would look at an equation. When you think through an equation, you think order of operations, not left to right.
With the HP-50G you can enter in huge expressions all pretty like a textbook as well (equation writer). I use the equation writer quite often too.
Seriously though, calculators are kind of silly now. The only reason I have them is for fun really... When everybody in my classes has Maple on their laptops, why would you need a clunky hand calculator? I use mine more when I tutoring than when Im in a lab or doing class work.
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Legend9123
Registered: 09/24/06
Posts: 2,590
Last seen: 10 months, 29 days
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Re: arcsin and ti-89 titanium [Re: DieCommie]
#8195907 - 03/26/08 10:24 AM (16 years, 24 days ago) |
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Quote:
DieCommie said:
Seriously though, calculators are kind of silly now. The only reason I have them is for fun really... When everybody in my classes has Maple on their laptops, why would you need a clunky hand calculator? I use mine more when I tutoring than when Im in a lab or doing class work.
Exams?
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Those who would give up a little freedom to get a little security shall soon have neither.
-Benjamin Franklin
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TheCow
Stranger
Registered: 10/28/02
Posts: 4,790
Last seen: 15 years, 9 months
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Re: arcsin and ti-89 titanium [Re: DieCommie]
#8195909 - 03/26/08 10:25 AM (16 years, 24 days ago) |
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Why would you want a clunky laptop? My Ti-89 can handle a fair amount of the symbolic integrals Ill throw at it. Also it can solve for variables, and do some other stuff, also its sexual to me. Furthermore, who uses maple? You better get yourself a real math program nigga
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Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 6 days
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Re: arcsin and ti-89 titanium [Re: DieCommie]
#8195914 - 03/26/08 10:25 AM (16 years, 24 days ago) |
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Quote:
RPN is more closely related to how you would look at an equation. When you think through an equation, you think order of operations, not left to right.
Exactly. When I work an equation, I think of it as a series of expressions. With RPN, I can work out each expression individually and then combine them into a result as I go. If I have common expressions, I only enter them once, and then duplicate the entry on the stack. I can unroll the stack to undo my work if I make a mistake.
At first RPN seems backwards, but once you start to use it, you realize that you have been taught backwards and that RPN is really the natural way to think through equations. Although I have had to do some arm twisting to get people to use RPN, I have not had a single person go back to non-RPN after getting past the (very brief) learning curve.
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Just another spore in the wind.
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Annom
※※※※※※
Registered: 12/22/02
Posts: 6,367
Loc: Europe
Last seen: 10 months, 25 days
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Re: arcsin and ti-89 titanium [Re: TheCow]
#8195927 - 03/26/08 10:29 AM (16 years, 24 days ago) |
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>Why would you want a clunky laptop?
Because a laptop has a high resolution color screen and, more important, a keyboard and a mouse
I mainly use my calculator for exams.
What is your "real" math program?
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DieCommie
Registered: 12/11/03
Posts: 29,258
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Re: arcsin and ti-89 titanium [Re: Seuss]
#8195956 - 03/26/08 10:42 AM (16 years, 24 days ago) |
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Haha, I figured I would get some slack for being anti calculator.
As far as exams go, I dont think calculators are useful in math education at all. They tell these college algebra students to get a Ti-83, I think it only hurts them in the end. I have seen students add single digit numbers on their graphing calculator before.  I dont think teachers should write math tests for calculator use. In science classes like physics or chem, I can see why you would need a calculator for a test. But you certainly wouldnt need an expensive graphing one, just a little cheap one would do.
For doing work, not tests, a computer is always near by. Most things are much more convenient to do on Maple than a calculator. I do use my calculator, but I sense the end of days for these little devices fast approaching. The calculators of the future will be software on your cell phones/PDA or laptops.
So, cow, what is 'real' math software? Mathematica? MatLab? Now that I think about it, I probably use a spreadsheet just as much as Maple or a calculator 
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,166
Loc: my room
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Re: arcsin and ti-89 titanium [Re: DieCommie]
#8195974 - 03/26/08 10:48 AM (16 years, 24 days ago) |
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I use a HP 48g myself, and concur with the following passage from http://en.wikipedia.org/wiki/Reverse_Polish_notation
Quote:
When an RPN calculator is unavailable, frequent users of RPN calculators may find use of infix calculators difficult due to habit. The usual fault is trying to use the equals key as enter. Whatever the error, calculations get lost and have to be re-started.
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