CASTI-89 TITANIUM · CALC89
cos(
Returns the cosine of an angle, interpreted in the current angle mode. For standard angles such as π/3 the result is exact.
Syntax
cos(expr)
- Group
- Trigonometry
- Arguments
- Takes one angle or expression.
- Availability
- Included
Example
| Input | Result |
|---|---|
| cos(π/3) | 1/2 |
Typing cos(π/3) on the home screen and pressing ENTER returns 1/2.
Keystrokes on the TI-89 Titanium
2NDCOS
The same key sequence inserts cos( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- 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.
- csc(Returns the cosecant of an angle, interpreted in the current angle mode.