3. Try solving a simpler related problem: For example, substitute appropriate simple numbers for
some of the variables, or conversely try substituting variables for some of the messy constants or
subexpressions.
4. Use a simpler physical model (such as ignoring friction).
5. Use the taylor() function or other means to replace an expression with a simpler approximation.
Sigma(1/(n^3),n,1,infinity) doesn't return an answer - why?
The function sum (1/(n^k), n, 1, infinity) (the sum of 1/ (n raised to the k-th power) as n goes from one
to infinity) works when k is an even number, but when k is odd the unit simply returns the expression.
Example:
3->k
sum(1/(n^k),n,1,infinity).
The unit returns (in pretty print),
Reason:
Without the Riemann zeta function, there is not an exact closed form of that answer unless k is even
and greater than one. DERIVE and Maple have a built-in Riemann zeta function, but the TI-92
doesn't. However, you can always approximate the result by using a large constant in place of
infinity.
Simplification ignores path names for variables - why?
Path names are simplified when they reference a defined variable. The contents of the defined
variable replace the path name in the expression. For undefined variables, there is not any attempt to
determine if the paths are referencing the same variable. For example, with the main folder current,
x+main\x ENTER will not simplify to 2x even though they are really the same variable.
Scrolling a long answers on the Program IO screen.
You cannot scroll answers on the IO screen. You must display the answer on the Home Screen before
you can scroll through it.
Replacing the cover (snap cover) back on the TI-92.
The cover only fits on the TI-92 one way. Be sure that the tabs on the top sides of the calculator match
up with the inserts in the cover. Also, the printing on the outside of the cover should be right side up
when placed on the calculator.
Product function (symbolic) algorithm.
Iterated multiplication is used for modest numeric limits. Other products are determined by checking for
telescoping products and simple patterns. Limits are used for infinite product limits.
Programming language - is the TI-92's like the 82 and 85?
The TI-92 contains a superset of the TI-82 and TI-85 programming language. A number of features
were added to specifically address needs from TI-82 and TI-85 users like: memory management,
deleting variables, enhanced string features, enhanced graphics features, local variables, user defined
functions, and parameter passing with programs and functions.
Programming language of the TI-92 - is it BASIC?
No. There are a number of features that are similar to the BASIC programming language, but it is not
BASIC.
B - 7
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