### How to simplify a simple expression

Which kind of simplify do I have to use for this kind of expressions?

```
251*sin(4/5*pi)^2 + 251/8*sqrt(5) + 753/8
-750751*sin(4/5*pi)^2 - 750751/8*sqrt(5) - 2252253/8
11593285251*sin(4/5*pi)^2 + 11593285251/8*sqrt(5) + 34779855753/8
-613498040952501*sin(4/5*pi)^2 - 613498040952501/8*sqrt(5) - 1840494122857503/8
```

Interestingly also Maple has problems with these expressions; Mathematica reduces them immediately.