# Acos Procedure

Returns the arc cosine of the number, in radians.

Warning: The input number is internally converted to a less precise

64-bit binary floating-point format.
The result is computed in this format and then converted back to TMBASIC's

128-bit decimal floating-point format.
These conversions may cause a loss of precision.

Declaration

function Acos(x as Number) as Number

### Parameters

### Return value

Number — Arc cosine of

*x*.

### Example

Code

print Trunc(Acos(0.25) * 1000)

Output