View source for Mathematical functions

==Functions of the JavaScript Object Math==
The following functions are part of every JavaScript virtual machine:
* ''Math.abs'';
* ''Math.acos'';
* ''Math.asin'';
* ''Math.atan'';
* ''Math.ceil'';
* ''Math.cos'';
* ''Math.exp'';
* ''Math.floor'';
* ''Math.log'';
* ''Math.max'';
* ''Math.min'';
* ''Math.random'';
* ''Math.sin'';
* ''Math.sqrt'';
* ''Math.tan'';

JSXGraph expands the set of available mathematical functions. To keep the JavaScript implementations clean, the new mathematical functions are part of the JSXGraph board.
That means, initially a board has to be created, for example with the command
<source lang="javascript">
board = JXG.JSXGraph.initBoard('box', {originX: 250, originY: 250, unitX: 40, unitY: 40});
</source>
Then, the object ''board'' contains the following additional mathematical functions:
* ''board.angle(A, B, C)'': for Point objects A, B, C. (A: name string, id string or object pointer)
* ''board.rad(A, B, C)''
* ''board.distance(arr1, arr2)'': Euclidean distane between two vectors
* ''board.pow(a, b)'': <math>a^b</math> for floating point value of ''b''. Math.pow is defined for integer values of ''b', only.
* ''board.round(x, n)'': returns string with fixed point representation of ''x''. May be replaced by string.tofixed(n).
* ''board.cosh(x)''
* ''board.sinh(x)''
* ''board.D(f)'': Numerically computed derivative of the function ''f'', returns a function.
* ''board.I(interval,f)'': Numerically computed v alue integral of the function ''f'' in the given interval.
* ''board.root(f,x)'': root of the function f. Uses Newton methon with start value ''x''.