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5.9.8  The sine integral function:Si

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) = 
x


0
 
sin(t)
t
 dt

This satisfies Si(0) = 0, Si(−∞) = −π/2 and Si(+∞) = π/2. Also note that Si is an odd function.
Input:

Si(1.0)

Output:

0.946083070367

Input:

Si(-1.0)

Output:

-0.946083070367

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