CASTI-89 TITANIUM · CALC89
P▶Rx(
Converts polar coordinates to the rectangular x coordinate, x=r·cos(θ).
Syntax
P▶Rx(r, θ)
- Group
- Trigonometry
- Arguments
- Takes the radius r and the angle θ.
- Availability
- Included
- Menu path
- MATH ▸ Angle ▸ R◀▶P ▸ P▶Rx(
Example
| Input | Result |
|---|---|
| P▶Rx(2,π/3) | 1 |
Typing P▶Rx(2,π/3) on the home screen and pressing ENTER returns 1.
Keystrokes on the TI-89 Titanium
2NDMATH2▶×33
The same key sequence inserts P▶Rx( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- P▶Ry(Converts polar coordinates to the rectangular y coordinate, y=r·sin(θ).
- R▶Pr(Converts rectangular coordinates to the polar radius r, the distance of the point from the origin.
- R▶Pθ(Converts rectangular coordinates to the polar angle θ, in the current angle mode.
- sec(Returns the secant of an angle, interpreted in the current angle mode.
- sech(Returns the hyperbolic secant of a value.
- sech⁻¹(Returns the inverse hyperbolic secant of a value.
- sec⁻¹(Returns the angle whose secant is the given value, in the current angle mode.
- sin(Returns the sine of an angle, interpreted in the current angle mode.