CASTI-89 TITANIUM · CALC89
tan⁻¹(
Returns the angle whose tangent is the given value, in the current angle mode. For standard values the angle is exact, for example a multiple of π.
Syntax
tan⁻¹(expr)
- Group
- Trigonometry
- Arguments
- Takes one value or expression.
- Availability
- Included
Example
| Input | Result |
|---|---|
| tan⁻¹(1) | π/4 |
Typing tan⁻¹(1) on the home screen and pressing ENTER returns π/4.
Keystrokes on the TI-89 Titanium
◆TAN-1
The same key sequence inserts tan⁻¹( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- cos(Returns the cosine of an angle, interpreted in the current angle mode.
- cosh(Returns the hyperbolic cosine of a value.
- cosh⁻¹(Returns the inverse hyperbolic cosine of a value.
- cos⁻¹(Returns the angle whose cosine is the given value, in the current angle mode.
- cot(Returns the cotangent of an angle, interpreted in the current angle mode.
- coth(Returns the hyperbolic cotangent of a value.
- coth⁻¹(Returns the inverse hyperbolic cotangent of a value.
- cot⁻¹(Returns the angle whose cotangent is the given value, in the current angle mode.