RAD Studio VCL Reference
Math.ArcCos Function

Calculates the inverse cosine of a given number.

function ArcCos(const X: Extended): Extended; overload;
function ArcCos(const X: Double): Double; overload;
function ArcCos(const X: Single): Single; overload;
Extended ArcCos(const Extended X);
Double ArcCos(const Double X);
Single ArcCos(const Single X);

ArcCos returns the inverse cosine of X.  

X must be between -1 and 1.  

The return value is in the range [0..Pi], in radians. 


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