Function fxydxdy

fxydxdy(
    func: ChalkboardFunction,
    xinf: number,
    xsup: number,
    yinf: number,
    ysup: number,
): number
Calculates the double integration of a multivariable function.
Parameters
- func: ChalkboardFunction
  The function
- xinf: number
  The lower x-bound
- xsup: number
  The upper x-bound
- yinf: number
  The lower y-bound
- ysup: number
  The upper y-bound
Returns number
- Defined in Chalkboard.calc.ts:587