CASTI-89 TITANIUM · CALC89
approx(
Evaluates an expression numerically and returns a decimal approximation, even when the calculator is in exact mode. Use it to check an exact answer such as π or √(2) as a decimal.
Syntax
approx(expr)
- Group
- Algebra
- Arguments
- Takes one expression to approximate.
- Availability
- Included
- Menu path
- F2 Algebra ▸ approx(
Example
| Input | Result |
|---|---|
| approx(π) | 3.14159265359 |
Typing approx(π) on the home screen and pressing ENTER returns 3.14159265359.
Keystrokes on the TI-89 Titanium
F25
The same key sequence inserts approx( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- cFactor(Factors an expression over the complex numbers, so factors with non-real coefficients such as x+ⅈ are allowed.
- comDenom(Combines a sum of fractions into one reduced fraction over a common denominator.
- completeSquare(Rewrites a quadratic expression in completed square form.
- cPolyRoots(Returns all roots of a polynomial as a list, including non-real complex roots.
- cSolve(Solves an equation over the complex numbers and returns both real and non-real solutions.
- cZeros(Returns the real and non-real zeros of an expression as a list.
- domain(Returns the domain of an expression with respect to a variable as a condition, for example x≠0.
- exact(Converts a decimal or approximate value into an exact rational form where possible.