Defines functions for 3rd order polynomial functions of one variable with only real coefficients.
        
        
Methods
    Provides the discriminant of the cubic equation from the supplied coefficients.
    
| Name | Type | Description | 
|---|---|---|
| a | Number | The coefficient of the 3rd order monomial. | 
| b | Number | The coefficient of the 2nd order monomial. | 
| c | Number | The coefficient of the 1st order monomial. | 
| d | Number | The coefficient of the 0th order monomial. | 
Returns:
    The value of the discriminant.
    
    Provides the real valued roots of the cubic polynomial with the provided coefficients.
    
| Name | Type | Description | 
|---|---|---|
| a | Number | The coefficient of the 3rd order monomial. | 
| b | Number | The coefficient of the 2nd order monomial. | 
| c | Number | The coefficient of the 1st order monomial. | 
| d | Number | The coefficient of the 0th order monomial. | 
Returns:
    The real valued roots.
    
