Returns the inverse cosine (the arccosine) of a number.
- returns the inverse trigonometric cosine of number, in other words the angle (in radians) whose cosine is number. The angle returned is between 0 and PI.
- To return the angle in degrees, use the DEGREES function.
- returns 3.14159265358979 (PI radians).
- returns 60. The cosine of 60 degrees is 0.5.