add missing math functions

api-global-func-Math.md

@@ -1,14 +1,30 @@
 # Math
 
-TODO
+These are all of the math functions provided to ZScript. These are available in
+all contexts. Note that all angles are in degrees.
 
 ```
 Type   Abs(Type n);
+double ACos(double n);
+double ASin(double n);
+double ATan(double n);
 double ATan2(double y, double x);
 uint   BAM(double angle);
+double Ceil(double n);
 Type   Clamp(Type n, Type minimum, Type maximum);
+double Cos(double n);
+double CosH(double n);
+double Exp(double n);
+double Floor(double n);
+double Log(double n);
+double Log10(double n);
 Type   Max(Type n, Type maximum);
 Type   Min(Type n, Type minimum);
+double Sin(double n);
+double SinH(double n);
+double Sqrt(double n);
+double Tan(double n);
+double TanH(double n);
 double VectorAngle(double x, double y);
 ```
 
@@ -16,20 +32,63 @@ double VectorAngle(double x, double y);
 
    Returns `|n|` (absolute of `n`.)
 
+- `ACos`
+
+   Returns the arc-cosine of `n`.
+
+- `ASin`
+
+   Returns the arc-sine of `n`.
+
+- `ATan`
+
+   Returns the arc-tangent of `n`.
+
 - `ATan2`
 
-   Computes the arctangent of `y / x` using the arguments' signs to determine
+   Returns the arc-tangent of `y / x` using the arguments' signs to determine
    the correct quadrant.
 
 - `BAM`
 
    Returns a byte angle of `angle` (`degrees * (0x40000000 / 90.0)`.)
 
+- `Ceil`
+
+   Returns the integral portion of `n`, rounded up.
+
 - `Clamp`
 
    Returns `n` if `n` is more than `minimum` and less than `maximum`, or either
    of those values if it is not.
 
+- `Cos`
+
+   Returns the cosine of `n`.
+
+- `CosH`
+
+   Returns the hyperbolic cosine of `n`.
+
+- `Exp`
+
+   Returns euler's number raised to the power `n`. Note that you probably want
+   instead the `**` binary operator, as in `a ** b`, since euler's number is
+   generally not a very useful constant when programming games.
+
+- `Floor`
+
+   Returns the integral portion of `n`, rounded down.
+
+- `Log`
+
+   Returns the natural (base of euler's number) logarithm of `n`.
+
+- `Log10`
+
+   Returns the common (base 10) logarithm of `n`. Note that this is useful for
+   instance when calculating the number of decimal digits in a number.
+
 - `Max`
 
    Returns `n` if `n` is less than `maximum`, or `maximum`.
@@ -38,6 +97,26 @@ double VectorAngle(double x, double y);
 
    Returns `n` if `n` is more than `minimum`, or `minimum`.
 
+- `Sin`
+
+   Returns the sine of `n`.
+
+- `SinH`
+
+   Returns the hyperbolic sine of `n`.
+
+- `Sqrt`
+
+   Returns the square root of `n`.
+
+- `Tan`
+
+   Returns the tangent of `n`.
+
+- `TanH`
+
+   Returns the hyperbolic tangent of `n`.
+
 - `VectorAngle`
 
    Same as `ATan2`, but with arguments reversed.