Hi PG

Though you should what output you expect(that helps the answerer). Assuming you 
expect solution in terms of `sin` or `cos` or some trigonometry. You can fo 
this:
```
>>> expr = (2+2*I)*exp(I*a) - (2-2*I)*exp(-I*a)
>>> simplify(expr.rewrite(sin))
4*sqrt(2)*I*sin(a+pi/4)
```

Cheers
Gaurav

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