Function d2fdx2

d2fdx2(func: ChalkboardFunction, val: number): number | ChalkboardVector
Calculates the second-order derivative of a 2D scalar or parametric function at a value.
Parameters
- func: ChalkboardFunction
  The function
- val: number
  The value
Returns number | ChalkboardVector
- Defined in Chalkboard.calc.ts:163