 
 
 
The Si command takes as argument a complex number.
Si returns the value of the sine integral function Si at
the point, where 
| Si(x) = | ∫ | 
 | 
 | dt | 
This satisfies Si(0) = 0, Si(−∞) = −π/2 and Si(+∞)
= π/2. Also note that Si is an odd function.
Input:
Output:
Input:
Output:
 
 
