### What is the problem with that integral ?

I try to integrate this:

```
sage: integrate(integrate(integrate(2*cos(z)*sin(atan((2*cos(y)-0.5+x)/(2*sin(y)))),y,0,pi/2),x,0,1),z,0,pi/2);
```

There is a problem :

```
"ECL says: In function ZEROP, the value of the only argument is
((RAT SIMP) -0.5 1.0)
which is not of the expected type NUMBER"
```

Could you help me please ?

Wolfram ~~do ~~does it so I think it is not an error of the function maybe a limit ?