ACOS
The angle (in radians) whose cosine is a number.
Syntax
ACOS(x)
| Argument | Meaning |
|---|---|
| x | A number. |
Result
An angle in radians.
Examples
In the example drawing:
| Expression | Gives |
|---|---|
ACOS(0) |
1.5708 |
RTOD(ACOS(0.5)) |
60 |
Notes
For degrees, use RTOD. x must be from -1 to 1: outside that, the result is NaN (not a number).