Re: Help with TI-83 program
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Re: Help with TI-83 program
Your program:
(E2+F2)-(2*E*F*cos(A)) -> D
(B2-D2-F2)/(-2*D*F) -> U
cos-1(U) -> B
In your program, do you intend that the variables be named E2, F2, B2, and D2.
Variables on the TI-83 are restricted to one letter.
In the case above, the calculator is multiplying E by 2, F by 2,etc.
I suspect that you really want E^2+F^2, etc.
The domain error you are getting is probably due to the last line, cos-1(U)
If it turns out that if U>1 or U<-1 then U is not in the domain of the inverse
cosine function for this calculator. If you were using a TI-85/86 you would
get the complex result.
The SSA case can result in one positive real solution, two positive real
solutions (the ambiguous case), or no positive real solutions.
In a program the SSA case can be solved by using the quadratic formula to
solve the law of cosines. By checking the discriminant, you can easily
determine whether there are one, two, or no real positive solutions to the
triangle.
------------------------------------------------------------------
Ben Sultenfuss <bsultenfuss@sfasu.edu>
Stephen F. Austin State University
Department of Mathematics and Statistics
1936 North Street, PO Box 13040, SFA Station
Nacogdoches, Texas 75962-3040
Voice: Office: 409-468-3805 Home: 409-560-5508
Fax: Office: 409-468-1669 Home: 409-560-0038
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-----Original Message-----
From: BHegge7615 <BHegge7615@AOL.COM>
To: CALC-TI@LISTS.PPP.TI.COM <CALC-TI@LISTS.PPP.TI.COM>
Date: Monday, March 16, 1998 19:01
Subject: Help with TI-83 program
>DEAR SUBSCRIBERS:
>
>I got a domain error on the following equation.
>I was wondering whether or not someone would
>be able to help me with it.
>
>(E2+F2)-(2*E*F*cos(A)) -> D
>(B2-D2-F2)/(-2*D*F) -> U
>cos-1(U) -> B
>
>
>I was planning on using this as part of a program
>used to calculate angles and sides using the law of cosines.
>Thank you sincerelly
>
>~BHegge7615