fx-82MS fx-82TL fx-9860GII TI-83
cos⁻¹
On a Casio calculator you can calculate the inverse cosine
cos⁻¹ E
SHIFT cos
or via the CATALOG as
CATALOG INPUT SHIFT 4 cos⁻¹ F1
Example 1
To calculate cos⁻¹(1) = 0° in degrees
cos⁻¹ SHIFT cos cos-1 1 EXE cos-1 1 0
Example 2
To calculate cos⁻¹(-1) = π in radians
cos⁻¹ SHIFT cos (–) 1 EXE cos-1 -1 π
Example 3
To calculate cos⁻¹(0) = ½π in radians
cos⁻¹ SHIFT cos 0 EXE cos-1 0
