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**abel****Member**- Registered: 2005-09-07
- Posts: 1

Hi there...i would very much like to know the analytical solution to the following exponential integral...

Exp[a*cos(b-c)] dc

where a and b are constants and cos is the cosine.

Thanks in advance,

Abel

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**kylekatarn****Member**- Registered: 2005-07-24
- Posts: 445

I can only give you the definition of exponential integral because my knowlege on this topic is very limited.

```
∞ z^k 1
Ei(z) = ∑ (-----) + EULER_GAMMA_CONSTANT + -ln(z²)
k=1 k.k! 2
```

I don't know if this helps

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