CASTI-89 TITANIUM · CALC89
cos⁻¹(
Returns the angle whose cosine is the given value, in the current angle mode. For standard values the angle is exact, for example a multiple of π.
Syntax
cos⁻¹(expr)
- Group
- Trigonometry
- Arguments
- Takes one value or expression.
- Availability
- Included
Example
| Input | Result |
|---|---|
| cos⁻¹(1/2) | π/3 |
Typing cos⁻¹(1/2) on the home screen and pressing ENTER returns π/3.
Keystrokes on the TI-89 Titanium
◆COS-1
The same key sequence inserts cos⁻¹( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- 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.
- csc(Returns the cosecant of an angle, interpreted in the current angle mode.
- csch(Returns the hyperbolic cosecant of a value.
- csch⁻¹(Returns the inverse hyperbolic cosecant of a value.
- csc⁻¹(Returns the angle whose cosecant is the given value, in the current angle mode.