Texas Instruments TI-89 Tip List page 424

! Construct a segment from the center to the point A. Construct a point (C) at the intersection of the
bisector line and this radius. Construct the locus of point C as point A moves on the circle. That
will form an ellipse.
cZeros() (complex zeros) function algorithm
cZeros(expr,var) is expr>list(cSolve(expr=0,var),var).
Does TI supply a TI-92 ViewScreen and the separate parts?
Since every TI-92 sold in the US has the ViewScreen remote panel connector TI does not supply the
separate VSCalc like other models of graphing calculators. We also expect more demand for the
ViewScreen LCD panel for the TI-92 than for previous models because teachers can buy the TI-92 first
and then upgrade to the ViewScreen later.
Dealers can manage their inventory better by just stocking the TI-92 and VS-LCD and putting them
together as needed to make up ViewScreen packages. TI only sells those two parts to dealers and
does not sell a 92VS combination. TI has adjusted the price on the 92VS-LCD so that a TI-92 and
92VS-LCD together have the same dealer price as the ViewScreen was quoted before.
We still expect dealers to list the 92 ViewScreen on their price sheets.
Division by zero - how can I create this error?
A division by zero error is only created while using the Graph/Math functions. You will not encounter a
division by zero error when working with the CAS on the home screen or in a program.
Display an angle in DMS format on the Program I/O screen.
You can only display values in Degrees-Minutes-Seconds format on the Home Screen.
Display - does it scratch?
Yes, the display can scratch. Please be careful not to touch the display with pencils, erasers, or any
sharp objects.
Differential equations - why doesn't the TI-92 have them?
There are several reasons why a product feature is included or excluded. To make products
affordable, we have to limit the amount of memory (ROM) used for the system software; more ROM
means higher cost. Therefore, we spend a great deal of time talking to educators about the features
that are most useful in the classroom to the most students. For example, there are much fewer
students taking college differential equations than taking high school algebra.
The features that have been on previous products that are not on the TI-92 are: differential equation
graph mode, some extra linear algebra functions (eigenvalues,eigenvectors, LU decomposition, cond),
and an interactive solver.
DERIVE - does the TI-92 have ALL of DERIVE's features?
The computer algebra software in the TI-92 is not DERIVE, in whole or part. It was jointly developed
by Texas Instruments and the authors of DERIVE. It will do some things that DERIVE will not do and
DERIVE will do some thing the TI-92 will not do. Generally, however, it is a fully capable symbolic
manipulation package.
Define a function from a program prompt.
To Define a function from a program prompt, convert the function contents to a string (if it is not
already) and use the expr() function: expr("function string"&"store f(x)")
Example:
B - 13